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# Index: M

m class
  sendmail, 19.6. Alphabetized m4 Macros
  sendmail, 32.5. Alphabetized Reference
M configuration command
  sendmail, 5.3.1. Mail Delivery Agents
  sendmail, 6.2. Define a Mail Delivery Agent
  sendmail, 6.3. The local Delivery Agent
  sendmail, 30.1. Configuration File Syntax
-m database switch : sendmail, 33.3.4.5. -m suppress replacement on match (V8.1 and above)
m flag : sendmail, 30.8. Alphabetized F= Flags
M flag
  sendmail, 14.2.3. The Message-ID: Header
  sendmail, 30.8. Alphabetized F= Flags
M line (qf file)
  sendmail, 23.4.1. Printing the Queue in Verbose Mode
  sendmail, 23.9. The qf File Internals
M lines in sendmail.cf : sendmail, 3.1. Role in the Filesystem
$m macro
  sendmail, 7.3.1. The hostname
  sendmail, 12.1.7. Adding the Domain
  sendmail, 31.10. Alphabetized Reference
$M macro : sendmail, 31.10. Alphabetized Reference
m option : (see MeToo (m) option)
M option
  sendmail, 31.2. Command-Line Definitions
  sendmail, 34.1.3. Appropriateness of Options
  sendmail, 34.8. Alphabetized Reference
M rule-testing command : sendmail, 38.4.2. Show Delivery Agents with =M
-m switch (sendmail)
  sendmail, 18.3.2. The makesendmail Script
  sendmail, 36.7. Alphabetized Reference
-M switch (sendmail)
  sendmail, 31.2. Command-Line Definitions
  sendmail, 36.7. Alphabetized Reference
m4 macros
  TCP/IP Network Administration, 10.4.1.1. Building a sendmail.cf with m4 macros
  TCP/IP Network Administration, E.3. m4 sendmail Macros
m4 preprocessor
  sendmail, 16.3. Run m4
  sendmail, 19. V8 m4 Configuration
  class macros and : sendmail, 32.3. Class with m4
  comments in files : sendmail, 19.5. Pitfalls
  configuration version : sendmail, 31.10. Alphabetized Reference
  database maps and : sendmail, 33.6. Database Maps and m4
  delivery agent configuration : sendmail, 30.3. m4 Configuration Syntax
  diversions : sendmail, 19.1.4. m4 diversions
  macros and : sendmail, 31.8. Macros with the m4 Technique
  rule sets and : sendmail, 29.2. Rule Sets and m4
  sendmail options and : sendmail, 34.3. Configuring with V8 m4 Options
M= equate : sendmail, 30.4. The Equates
MAC (Mandatory Access Controls) : Practical UNIX & Internet Security, 4.1.3. Groups and Group Identifiers (GIDs)
MACH operating system : Practical UNIX & Internet Security, 1.3. History of UNIX
machine
  auditing : (see auditing)
  backing up : Building Internet Firewalls, 13.5.1. Backing Up Your Filesystems
  choosing : Building Internet Firewalls, 5.3. Choosing a Machine
  configuring : Building Internet Firewalls, 5.8.4. Reconfiguring for Production
  connecting : Building Internet Firewalls, 5.8.6. Connecting the Machine
  disconnecting or shutting down : Building Internet Firewalls, 13.4.3. Planning for Disconnecting or
  hardware : (see hardware)
  hijacking : Building Internet Firewalls, 10.1.1. Hijacking
  name : Practical UNIX & Internet Security, 16.2.3. Hostnames
  physical location of : Building Internet Firewalls, 5.4. Choosing a Physical Location
  securing : Building Internet Firewalls, 5.8.1. Securing the Machine
  software : (see software)
  speed of : Building Internet Firewalls, 5.3.2. How Fast a Machine?
MACHINE= command
  Practical UNIX & Internet Security, 15.5.1.2. Name-value pairs
  Practical UNIX & Internet Security, 15.5.2. Permissions Commands
macid() : sendmail, 20.3. Alphabetized V8.8 Subroutines
Macintosh
  Practical UNIX & Internet Security, 18.2. Running a Secure Server
  sendmail, 3.3.3. Other Protocols
macro conditionals
  sendmail, 14.1.3. Testing So Far
  sendmail, 31.6. Macro Conditionals: $?, $|, and $.
  TCP/IP Network Administration, 10.5.2.1. Conditionals
macro virus : (see viruses)
macros
  sendmail, 5.3.2. Macros
  sendmail, 7. Macros
  sendmail, 31.9. Pitfalls
  class macros
    sendmail, 5.3.5. Class Macros
    sendmail, 12. Class
    sendmail, 32. Class Macros
  classes and : sendmail, 12.1.1.1. A caveat
  database macros : sendmail, 33. Database Macros
  declaring
    sendmail, 7.2. Defining Macros
    sendmail, 31.2. Command-Line Definitions
  defining
    sendmail, 19.4.2. Define Macros
    sendmail, 20.3. Alphabetized V8.8 Subroutines
    sendmail, 36.7. Alphabetized Reference
    sendmail, 38.2.1. Define a Macro with .D
    with M option : sendmail, 34.8. Alphabetized Reference
  dumping : sendmail, 38.3. Dump a Macro
  expanding : TCP/IP Network Administration, 10.6.2. Transforming the Address
  fetching value of : sendmail, 20.3. Alphabetized V8.8 Subroutines
  file class macros : sendmail, 5.3.6. File Class Macros
  for compiling sendmail : sendmail, 18.8. Alphabetized Reference
  in header fields : sendmail, 35.3.1. Macros in the Header Field
  initializing : sendmail, 36.4.2.2. Initialize macros
  m4 preprocessor : sendmail, 19. V8 m4 Configuration
  naming
    sendmail, 5.3.2. Macros
    sendmail, 7.2. Defining Macros
    sendmail, 31.4. Macro Names
    converting names to integers : sendmail, 20.3. Alphabetized V8.8 Subroutines
  predefined
    sendmail, 7.3. Predefined Macros
    sendmail, 31.1. Preassigned Macros
  required : sendmail, 31.3.1. Required Macros (V8.6 and earlier)
  restoring macro values : sendmail, 23.9. The qf File Internals
  in rule set names : sendmail, 29.1.4. Macros in Rule-Set Names
  in rules : sendmail, 28.1.1. Macros in Rules
  for time and date : sendmail, 31.7.2. Macros and the Date
macvalue() : sendmail, 20.3. Alphabetized V8.8 Subroutines
MAEs (Metropolitan Area Exchanges) : TCP/IP Network Administration, 1.1. TCP/IP and the Internet
magic cookies : Practical UNIX & Internet Security, 17.3.21.4. Using Xauthority magic cookies
magic number
  Practical UNIX & Internet Security, 5.1.7. File Permissions in Detail
  TCP/IP Network Administration, A.2. The PPP Daemon
mail
  (see email)
  (see sendmail)
MAIL command (SMTP)
  sendmail, 29.10.1. The check_mail Rule Set
  sendmail, 34.8. Alphabetized Reference
Mail Exchanger records : (see MX records)
"Mail-From:" header line : sendmail, 35.10. Alphabetized Reference
mail hubs : (see hubs)
/mail/imap.tar.Z file : TCP/IP Network Administration, 9.7.2. IMAP Server
mail program
  Practical UNIX & Internet Security, 15.1.3. mail Command
  sendmail, 3.2.1. Delivery to a Mailbox
mail11 program : sendmail, 3.3.3. Other Protocols
Mail_Aliases table (NIS+) : Practical UNIX & Internet Security, 19.5.3. NIS+ Tables
MAIL_HUB macro (m4)
  sendmail, 19.6. Alphabetized m4 Macros
  sendmail, 31.10. Alphabetized Reference
mailbox file : sendmail, 3.2.1. Delivery to a Mailbox
mailbox servers : TCP/IP Network Administration, 9.7. Mail Servers
  synchronizing : TCP/IP Network Administration, 9.7.2. IMAP Server
mailer
  definition fields : TCP/IP Network Administration, 10.5.8. Defining Mailers
    common : TCP/IP Network Administration, 10.5.8.1. Some common mailer definitions
  local : TCP/IP Network Administration, 10.5.8. Defining Mailers
MAILER command (UUCP) : sendmail, 31.10. Alphabetized Reference
MAILER() (m4)
  sendmail, 19.3.2. MAILER()
  sendmail, 30.3. m4 Configuration Syntax
MAILER-DAEMON alias
  sendmail, 3.1.1. The Aliases File
  sendmail, 24.4.2. The MAILER-DAEMON Alias
  sendmail, 31.10. Alphabetized Reference
  (see also $n macro)
MAILER source file (in sendmail)
  TCP/IP Network Administration, E.3. m4 sendmail Macros
  TCP/IP Network Administration, E.3.5. MAILER
  values available, listed : TCP/IP Network Administration, E.3.5. MAILER
mailer= equate (syslog output) : sendmail, 26.1.3.4. mailer= the delivery agent used
MAILER_DEFINITIONS macro (m4) : sendmail, 19.6. Alphabetized m4 Macros
mailertable database
  sendmail, 19.6. Alphabetized m4 Macros
  TCP/IP Network Administration, 10.7.1. Modifying Local Information
mailing lists
  Practical UNIX & Internet Security, E.1. Mailing Lists
  Practical UNIX & Internet Security, E.1.3.10. WWW-security
  sendmail, 1.3.3. Aliases and Mailing Lists
  sendmail, 17.1.2.1. A rule to handle List:;
  sendmail, 20.2.2. Workstation Refuses to Act as a Mail Gateway
  sendmail, 34.8. Alphabetized Reference
  (see also email)
  exploder lists : sendmail, 25.4. Exploder Mailing Lists
  EXPN command (SMTP) : sendmail, 22.3.2. SMTP vrfy and expn
  for distributing security information : TCP/IP Network Administration, 12.1.2.2. Use mailing lists to distribute information
  for exchanging information and ideas : TCP/IP Network Administration, 13.5. Mailing Lists
  :include: directive
    sendmail, 22.5.2. Permissions for :include:
    sendmail, 23.9. The qf File Internals
    sendmail, 25.2. :include: Mailing Lists
  including oneself on : sendmail, 34.8. Alphabetized Reference
  internal : sendmail, 25.1. Internal Mailing Lists
  joining : TCP/IP Network Administration, 13.5. Mailing Lists
  keeping current : Building Internet Firewalls, 12.3.1.1. Mailing lists
  list precedence : sendmail, 14.4. Precedence
  owner : sendmail, 25.3. Defining a Mailing List Owner
  packages for : sendmail, 25.6. Packages That Help
  resources via : Building Internet Firewalls, A.3. Mailing Lists
  sendmail and : TCP/IP Network Administration, 10.1. sendmail's Function
  troubleshooting : sendmail, 25.5. Problems with Mailing Lists
mailq command
  sendmail, 4.1.2. Show Queue Mode (-bp)
  sendmail, 36.1.2. mailq
mailstats program : sendmail, 26.2.2. Viewing Statistics: mailstats
maintaining firewalls : Building Internet Firewalls, 12. Maintaining Firewalls
maintenance mode : Practical UNIX & Internet Security, C.5.1. Process #1: /etc/init
maintenance personnel : Practical UNIX & Internet Security, 13.3. Outsiders
maintenance toolkits, ready-made : TCP/IP Network Administration, 11.2. Diagnostic Tools
Majordomo package
  sendmail, 25.6.1. Majordomo
  TCP/IP Network Administration, 13.5. Mailing Lists
make command
  sendmail, 2.5. Build
  TCP/IP Network Administration, 5.2. Linux Kernel Configuration
  make config command : TCP/IP Network Administration, 5.2. Linux Kernel Configuration
  make install.man : TCP/IP Network Administration, 9.4. A BOOTP Server
  make zImage command : TCP/IP Network Administration, 5.2. Linux Kernel Configuration
  in NIS : TCP/IP Network Administration, 9.3. Network Information Service
makedbm program : Practical UNIX & Internet Security, 19.4.4.1. Setting up netgroups
Makefile file
  sendmail, 2.4. Preliminaries
  sendmail, 18.4. Tuning Makefile
  db library package : sendmail, C.2. Get the Source
makemap command
  sendmail, 33.2. Create Files with makemap
  TCP/IP Network Administration, 10.4.1.1. Building a sendmail.cf with m4 macros
  TCP/IP Network Administration, E.1. Compiling sendmail
  TCP/IP Network Administration, E.4.4. The sendmail K Command
makesendmail script
  sendmail, 2.4. Preliminaries
  sendmail, 18.3.2. The makesendmail Script
  sendmail, 18.6. Install sendmail
malware : Practical UNIX & Internet Security, 11.1. Programmed Threats: Definitions
man pages : Practical UNIX & Internet Security, 2.5. The Problem with Security Through Obscurity
man-in-the-middle forgery : Building Internet Firewalls, 6.6.1. Risks of Filtering by Source
Management Information Base (MIB) : TCP/IP Network Administration, 11.9. Simple Network Management Protocol
management tools : Building Internet Firewalls, 2.10. Network Management Services
management, role of
  Practical UNIX & Internet Security, 2.3.4. Convincing Management
  Practical UNIX & Internet Security, 2.5. The Problem with Security Through Obscurity
managing accounts : Building Internet Firewalls, 12.1.2. Managing Your Accounts
MANs (Metropolitan Networks) : Practical UNIX & Internet Security, 16.1. Networking
manual logging
  Practical UNIX & Internet Security, 10.7. Handwritten Logs
  Practical UNIX & Internet Security, 10.7.2.2. Informational material
manual pages : Practical UNIX & Internet Security, 23.2. Tips on Avoiding Security-related Bugs
manual sendmail use : sendmail, 1.4. Run sendmail by Hand
map
  TCP/IP Network Administration, 1.7. Application Layer
  (see also automounter daemon)
  (see also /etc/hosts file)
  (see also /etc/networks file)
  (see also IMAP)
  (see also Network Information Service)
  (see also portmapper)
  building : TCP/IP Network Administration, 7.4.3. Open Shortest Path First
  name assigned a database : TCP/IP Network Administration, 10.6.2.1. Transforming with a database
  NIS : (see NIS)
/map rule-testing command : sendmail, 38.5.3. Look up a Database Item with /map
map_lookup() : sendmail, 20.3. Alphabetized V8.8 Subroutines
martians
  TCP/IP Network Administration, 4.2.1. Obtaining an IP Address
  TCP/IP Network Administration, B.7. Definition Statements
mask information : (see information)
masking
  TCP/IP Network Administration, 2.2.2. Classless IP Addresses
  TCP/IP Network Administration, 2.3. Subnets
MASQUERADE_AS macro (m4)
  sendmail, 19.6. Alphabetized m4 Macros
  sendmail, 31.10. Alphabetized Reference
MASQUERADE_DOMAIN macro (m4) : sendmail, 19.6. Alphabetized m4 Macros
MASQUERADE_DOMAIN_FILE macro (m4) : sendmail, 19.6. Alphabetized m4 Macros
masquerade_entire_domain feature : sendmail, 19.6. Alphabetized m4 Macros
masquerade_envelope feature : sendmail, 19.6. Alphabetized m4 Macros
masquerading
  sendmail, 19.4.4. Masquerading
  sendmail, 19.6. Alphabetized m4 Macros
  TCP/IP Network Administration, E.3.2. FEATURE
  TCP/IP Network Administration, E.3.4. DOMAIN
Massey, James L. : Practical UNIX & Internet Security, 6.4.1. Summary of Private Key Systems
Master mode (uucico) : Practical UNIX & Internet Security, 15.1.4. How the UUCP Commands Work
master server
  Practical UNIX & Internet Security, 19.4. Sun's Network Information Service (NIS)
  (see also NIS)
MatchGecos (G) option
  sendmail, 20.1.2. Global Variables
  sendmail, 34.8. Alphabetized Reference
MATCHGECOS macro : sendmail, 18.8. Alphabetized Reference
matching : (see wildcard operators)
MAX... macros : sendmail, 18.8. Alphabetized Reference
MaxDaemonChildren option
  sendmail, 34.1.3. Appropriateness of Options
  sendmail, 34.8. Alphabetized Reference
MaxHopCount (h) option : sendmail, 34.8. Alphabetized Reference
maximum line length
  sendmail, 30.4. The Equates
  sendmail, 30.8. Alphabetized F= Flags
maximum receive unit (MRU) : TCP/IP Network Administration, A.2. The PPP Daemon
maximum transmission unit (MTU)
  Building Internet Firewalls, C.5.1.3. Fragmenting datagrams
  TCP/IP Network Administration, 1.5.1.3. Fragmenting datagrams
  TCP/IP Network Administration, 6.1.1. Determining the Interface Name
  TCP/IP Network Administration, 6.1.2. Checking the Interface with ifconfig
  TCP/IP Network Administration, 6.1.5.4. Maximum transmission unit
  TCP/IP Network Administration, A.1. Dial-Up IP
  determining smallest : TCP/IP Network Administration, 5.2. Linux Kernel Configuration
MAXLINE variable : sendmail, 18.8. Alphabetized Reference
MaxMessageSize : sendmail, 34.8. Alphabetized Reference
maxpacketsize : TCP/IP Network Administration, B.8.6. The egp Statement
MaxQueueRunSize option
  sendmail, 23.4. Printing the Queue
  sendmail, 34.8. Alphabetized Reference
MAXRWSETS variable : sendmail, 29.1.2. Rule-Set Names
MBONE (Multicast Backbone)
  Building Internet Firewalls, 2.8. Real-Time Conferencing
  TCP/IP Network Administration, 5.2. Linux Kernel Configuration
  TCP/IP Network Administration, 5.3.1.1. Options
  configuring : Building Internet Firewalls, 8.9.3. The Multicast Backbone (MBONE)
mc files
  sendmail, 19.3. The Minimal mc File
  sendmail, 19.6. Alphabetized m4 Macros
MCERT : Practical UNIX & Internet Security, F.3.4.21. Motorola, Inc.
MCI Corporation : Practical UNIX & Internet Security, F.3.4.19. MCI Corporation
MD2 algorithm : Practical UNIX & Internet Security, 6.5.4.1. MD2, MD4, and MD5
MD4 algorithm
  Building Internet Firewalls, 10.3.1. One-Time Passwords
  Practical UNIX & Internet Security, 6.5.4.1. MD2, MD4, and MD5
MD5 algorithm
  Practical UNIX & Internet Security, 6.5.2. Using Message Digests
  Practical UNIX & Internet Security, 6.5.4.1. MD2, MD4, and MD5
  Practical UNIX & Internet Security, 23.5.1. Use Message Digests for Storing Passwords
  Practical UNIX & Internet Security, 23.9. A Good Random Seed
  digital signatures versus : Practical UNIX & Internet Security, 6.6.3.6. PGP detached signatures
  in POP : Practical UNIX & Internet Security, 17.3.10. Post Office Protocol (POP) (TCP Ports
MDAs (mail delivery agents) : (see MTAs)
media : Practical UNIX & Internet Security, 12.3.3. Other Media
  damaged by smoke : Practical UNIX & Internet Security, 12.2.1.2. Smoke
  destroying : Practical UNIX & Internet Security, 12.3.2.3. Sanitize your media before disposal
  failure of : Practical UNIX & Internet Security, 7.1.4. Guarding Against Media Failure
  hard/soft disk quotas : Practical UNIX & Internet Security, 25.2.2.5. Using quotas
  print through process : Practical UNIX & Internet Security, 12.3.2.1. Verify your backups
  rotating for backups : Practical UNIX & Internet Security, 7.1.3. Types of Backups
  rotation of : Practical UNIX & Internet Security, 7.2.1.2. Media rotation
  sanitizing : Practical UNIX & Internet Security, 12.3.2.3. Sanitize your media before disposal
  viruses from : Practical UNIX & Internet Security, 11.1.5. Viruses
meet-in-the-middle attacks : Practical UNIX & Internet Security, 6.4.5.1. Double DES
MEMCHUNKSIZE macro : sendmail, 18.8. Alphabetized Reference
memory
  Building Internet Firewalls, 1.1.2. Your Resources
  Building Internet Firewalls, 5.3.3. What Hardware Configuration?
  Practical UNIX & Internet Security, 25.2.2. Disk Attacks
  Practical UNIX & Internet Security, 25.2.2.8. Tree-structure attacks
  sendmail, 34.8. Alphabetized Reference
  hidden space : Practical UNIX & Internet Security, 25.2.2.7. Hidden space
  for logs
    Building Internet Firewalls, 12.1.3. Managing Your Disk Space
    Building Internet Firewalls, 12.2.2. What Should You Watch For?
  managing : Building Internet Firewalls, 12.1.3. Managing Your Disk Space
  reserved space : Practical UNIX & Internet Security, 25.2.2.6. Reserved space
  swap space : Practical UNIX & Internet Security, 25.2.3. Swap Space Problems
  /tmp directory and : Practical UNIX & Internet Security, 25.2.4. /tmp Problems
  tree-structure attacks : Practical UNIX & Internet Security, 25.2.2.8. Tree-structure attacks
memory-to-memory copies : TCP/IP Network Administration, 6.1.5.2. ARP and trailers
merging interior and exterior routers : Building Internet Firewalls, 4.3.2. It's OK to Merge the Interior Router and the Exterior Router
Merkle, Ralph : Practical UNIX & Internet Security, 6.4.5.1. Double DES
Message Authentication Code (MAC) : Practical UNIX & Internet Security, 6.5.5.2. Message authentication codes
Message Digest 5 (MD5) cryptographic checksum
  TCP/IP Network Administration, 7.4.3. Open Shortest Path First
  TCP/IP Network Administration, 7.7.1.1. A host configuration
  TCP/IP Network Administration, B.8.2. The rip Statement
message digests
  Practical UNIX & Internet Security, 6.5. Message Digests and Digital Signatures
  Practical UNIX & Internet Security, 6.5.2. Using Message Digests
  Practical UNIX & Internet Security, 9.2.3. Checksums and Signatures
  Practical UNIX & Internet Security, 23.5.1. Use Message Digests for Storing Passwords
  Tripwire package
    Practical UNIX & Internet Security, 9.2.4. Tripwire
    Practical UNIX & Internet Security, 9.2.4.2. Running Tripwire
"Message:" header line : sendmail, 35.10. Alphabetized Reference
message queue : (see queue)
"Message-ID:" header line
  sendmail, 1.5. The Header
  sendmail, 13.4. Sending Mail
  sendmail, 14.2.3. The Message-ID: Header
  sendmail, 26.1.3.5. msgid= the Message-ID: identifier
  sendmail, 30.8. Alphabetized F= Flags
  sendmail, 35.5.16. Replacing Headers with H_ACHECK
  sendmail, 35.10. Alphabetized Reference
message_volume.sh script : sendmail, 26.1.4.1. message_volume.sh
messages file : TCP/IP Network Administration, 12.4.2.2. Checking login activity
messages log file : Practical UNIX & Internet Security, 10.2.3. messages Log File
messages, error : (see error messages)
messages, email
  sendmail, 34.8. Alphabetized Reference
  TCP/IP Network Administration, 1.3. TCP/IP Protocol Architecture
  TCP/IP Network Administration, 1.5.2. Internet Control Message Protocol
  assigning priority to : TCP/IP Network Administration, 10.5.6. Defining Mail Precedence
  blank lines ending : sendmail, 30.8. Alphabetized F= Flags
  body of
    sendmail, 1.6. The Body
    sendmail, 23.2.2. The Data (Message Body) File: df
    (see also -B switch (sendmail))
  bouncing
    sendmail, 10.3. Missing Addresses
    sendmail, 13.2.2. Limit the Life of Queued Messages
    sendmail, 14.4. Precedence
    sendmail, 19.6. Alphabetized m4 Macros
    sendmail, 22.8.3.4. The PostmasterCopy option
    sendmail, 23.3.6. Savemail Panic
    sendmail, 23.7.1. Handling a Down Site
    sendmail, 24.4.1. The Postmaster Alias
    sendmail, 25.5.1. Reply Versus Bounce
    sendmail, 25.5.3. A list-bounced Alias
    sendmail, 34.8. Alphabetized Reference
    sendmail, 35.10. Alphabetized Reference
    sendmail, 36.7. Alphabetized Reference
    (see also $n macro)
  content type : TCP/IP Network Administration, 3.4.3. Multipurpose Internet Mail Extensions
  converting between 7- and 8-bit : sendmail, 18.8. Alphabetized Reference
  delivering : (see delivery)
  envelope : (see envelope)
  encapsulated : TCP/IP Network Administration, 3.4.3. Multipurpose Internet Mail Extensions
  error : (see errors)
  flooding : Practical UNIX & Internet Security, 25.3.2. Message Flooding
  forged : sendmail, 22.7. Forged Mail
  forwarding : sendmail, 35.7. Forwarding with Resent-Headers
  forwarding loops : sendmail, 25.7.2. Forwarding Loops
  headers for : (see headers, message)
  holding : (see queue)
  hop count : (see hop count)
  hub's acceptance of : sendmail, 15.4. Hub Accepts Mail for Client
  leading dots in : sendmail, 34.8. Alphabetized Reference
  limiting size of : sendmail, 20.2.3. Limit the Size of Guest Messages
  multipart subtype : TCP/IP Network Administration, 3.4.3. Multipurpose Internet Mail Extensions
  multiple objects in single : TCP/IP Network Administration, 3.4.3. Multipurpose Internet Mail Extensions
  origin date of : (see $a macro)
  priority of
    sendmail, 14.4. Precedence
    (see priority, message)
  processing limits on : sendmail, 23.5. How the Queue Is Processed
  queue
    sendmail, 1.3.2. The Queue
    sendmail, 23. The Queue
    checkpointing : sendmail, 34.8. Alphabetized Reference
    down sites and : sendmail, 23.7.1. Handling a Down Site
    lifetime
      sendmail, 13.2.2. Limit the Life of Queued Messages
      sendmail, 34.8. Alphabetized Reference
    message life : sendmail, 13.2.2. Limit the Life of Queued Messages
    message parts : sendmail, 23.2. Parts of a Queued Message
    printing
      sendmail, 4.1.2. Show Queue Mode (-bp)
      sendmail, 23.2.3.2. Locks shown when printing the queue
      sendmail, 23.4. Printing the Queue
      sendmail, 36.7. Alphabetized Reference
    processing
      sendmail, 23.5. How the Queue Is Processed
      sendmail, 23.9. The qf File Internals
      sendmail, 36.7. Alphabetized Reference
    putting everything in : sendmail, 34.8. Alphabetized Reference
    requeuing on error : sendmail, 25.7.6. Force Requeue on Error
    sendmail options for : sendmail, 34.6.2. The Queue
    sorting : sendmail, 34.8. Alphabetized Reference
    time message placed in : sendmail, 23.9. The qf File Internals
    troubleshooting : sendmail, 23.8. Pitfalls
    why message is stored in : sendmail, 23.9. The qf File Internals
  rejecting
    sendmail, 18.8. Alphabetized Reference
    sendmail, 20.2.6. Reject Mail from Spamming or Mail-bombing Sites
  relays for : sendmail, 19.4.5. Relays
  sending
    sendmail, 13.4. Sending Mail
    sendmail, 14.5. Sending Real Mail
  size of
    sendmail, 26.1.3.10. size= the size of the message
    sendmail, 30.4. The Equates
    sendmail, 34.8. Alphabetized Reference
  stored in queue in error : sendmail, 23.9. The qf File Internals
  time placed in queue : sendmail, 23.9. The qf File Internals
  unique identifier for
    sendmail, 13.4. Sending Mail
    sendmail, 14.2.3. The Message-ID: Header
    sendmail, 26.1.3.5. msgid= the Message-ID: identifier
messages, SMTP greeting
  sendmail, 31.10. Alphabetized Reference
  sendmail, 34.8. Alphabetized Reference
messages, warning : (see warning messages)
meta characters : Practical UNIX & Internet Security, 23.2. Tips on Avoiding Security-related Bugs
meta-packets, and filtering : Building Internet Firewalls, 6.8.4. It Should Allow Rules Based on Any
metadata
  Practical UNIX & Internet Security, 9.2.2. Checklists and Metadata
  Practical UNIX & Internet Security, 9.2.2.2. Ancestor directories
metasymbols : TCP/IP Network Administration, 10.6.1. Pattern Matching
  for transforming the address : TCP/IP Network Administration, 10.6.2. Transforming the Address
MeToo (m) option
  sendmail, 34.8. Alphabetized Reference
  sendmail, 36.7. Alphabetized Reference
metrics : TCP/IP Network Administration, 6.1.5.3. Metric
  arbitrariness of : TCP/IP Network Administration, 7.4.1.1. Running RIP with routed
  incompatibility of : TCP/IP Network Administration, 7.6.1. gated's Preference Value
Metropolitan Area Exchanges (MAEs) : TCP/IP Network Administration, 1.1. TCP/IP and the Internet
Metropolitan Networks (MANs) : Practical UNIX & Internet Security, 16.1. Networking
MH (mail handler) : Practical UNIX & Internet Security, 11.5.2.5. .forward, .procmailrc
MIB (Management Information Base) : TCP/IP Network Administration, 11.9. Simple Network Management Protocol
MIBI and MIBII : TCP/IP Network Administration, 11.9. Simple Network Management Protocol
Micro-BIT Virus Center : Practical UNIX & Internet Security, F.3.4.16. Germany: Southern area
mil domain : TCP/IP Network Administration, 3.3.1. The Domain Hierarchy
Miller, Barton : Practical UNIX & Internet Security, 23.1.2. An Empirical Study of the Reliability of UNIX Utilities
MILNET : Practical UNIX & Internet Security, F.3.4.20. Motorola, Inc.
MIME (Multipurpose Internet Mail Extensions)
  Building Internet Firewalls, 8.1.3. Multipurpose Internet Mail Extensions
  Practical UNIX & Internet Security, 11.1.5. Viruses
  sendmail, 5.3.8. Headers
  TCP/IP Network Administration, 1.2. A Data Communications Model
  TCP/IP Network Administration, 3.4.3. Multipurpose Internet Mail Extensions
  format errors : sendmail, 34.8. Alphabetized Reference
  headers for : sendmail, 35.6.7. MIME Headers
  sendmail and : TCP/IP Network Administration, 10.5.8. Defining Mailers
  standardizing on : TCP/IP Network Administration, 4.5.3. Planning Your Mail System
  types : TCP/IP Network Administration, 3.4.3. Multipurpose Internet Mail Extensions
"MIME-Version:" header line : sendmail, 35.10. Alphabetized Reference
MIME7TO8 macro : sendmail, 18.8. Alphabetized Reference
MIME8TO7 macro : sendmail, 18.8. Alphabetized Reference
MinFreeBlocks (b) option : sendmail, 34.8. Alphabetized Reference
minicom : TCP/IP Network Administration, 6.4.4. Troubleshooting Serial Connections
minimum matching
  sendmail, 8.7.2. Minimal Matching
  sendmail, 28.5.1. Minimum Matching
  sendmail, 32.2.3. Backup and Retry
MinQueueAge option
  sendmail, 23.9. The qf File Internals
  sendmail, 34.8. Alphabetized Reference
minus sign (hyphen)
  in machine conversation : sendmail, 4.2. Verbose (-v)
  non-equivalent host : TCP/IP Network Administration, 12.2.5. Secure the r Commands
missing addresses : (see addresses, null)
"Missing username" error : sendmail, 9.4. The error Delivery Agent
MIT-KERBEROS-5 authentication : Practical UNIX & Internet Security, 17.3.21.3. The xhost facility
Mitnick, Kevin : Practical UNIX & Internet Security, 27.2.6. Network Providers that Network Too Well
mixed multipart subtype : TCP/IP Network Administration, 3.4.3. Multipurpose Internet Mail Extensions
mknod command : TCP/IP Network Administration, 6.4.4. Troubleshooting Serial Connections
mkpasswd program : Practical UNIX & Internet Security, 8.8.4. Password Generators
mktemp function : Practical UNIX & Internet Security, 23.2. Tips on Avoiding Security-related Bugs
mobile network computing : Practical UNIX & Internet Security, 8.7. One-Time Passwords
mobile systems, requirements of : TCP/IP Network Administration, 3.6.1. Dynamic Host Configuration Protocol
mode command : TCP/IP Network Administration, 6.3.2. Dial-Up PPP
modem pools : Building Internet Firewalls, 10.6. Terminal Servers and Modem Pools
modems
  Practical UNIX & Internet Security, 14. Telephone Security
  Practical UNIX & Internet Security, 14.6. Additional Security for Modems
  TCP/IP Network Administration, 1.7. Application Layer
  (see also Automatic Call Unit)
  asynchronous : TCP/IP Network Administration, 5.3.1.2. Pseudo-device
  callback setups
    Practical UNIX & Internet Security, 14.4.2.
    Practical UNIX & Internet Security, 14.6. Additional Security for Modems
  carrier-detect (DCD) indicator, monitoring : TCP/IP Network Administration, 6.3.3. chat
  checking configuration of : TCP/IP Network Administration, 6.4.4. Troubleshooting Serial Connections
  clogging : Practical UNIX & Internet Security, 25.3.4. Clogging
  documentation : TCP/IP Network Administration, 6.4.4. Troubleshooting Serial Connections
  encrypting : Practical UNIX & Internet Security, 14.6. Additional Security for Modems
  hanging up : (see signals)
  high-speed dial-up : TCP/IP Network Administration, 6.2. TCP/IP Over a Serial Line
  physical security of
    Practical UNIX & Internet Security, 14.5.4. Physical Protection of Modems
    Practical UNIX & Internet Security, 14.6. Additional Security for Modems
  recording call information : Practical UNIX & Internet Security, 10.3.1. aculog File
  synchronous : TCP/IP Network Administration, 5.3.1.2. Pseudo-device
  tracing connections
    Practical UNIX & Internet Security, 24.2.4. Tracing a Connection
    Practical UNIX & Internet Security, 24.2.4.2. How to contact the system administrator of a computer
  UNIX and
    Practical UNIX & Internet Security, 14.5. Modems and UNIX
    Practical UNIX & Internet Security, 14.5.3.3. Privilege testing
modes
  daemon : sendmail, 4.1.1. Daemon Mode (-bd)
  delivery : sendmail, 13.2.3. The Default Delivery Mode
  sendmail operating : sendmail, 36.7. Alphabetized Reference
  TempFileMode option
    sendmail, 13.2.4. The Default File Permissions
    sendmail, 22.8.3.7. The TempFileMode option
modification times
  Practical UNIX & Internet Security, 5.1.2. Inodes
  Practical UNIX & Internet Security, 5.1.5. File Times
  Practical UNIX & Internet Security, 7.4.7. inode Modification Times
  Practical UNIX & Internet Security, 9.2.2. Checklists and Metadata
modifying Internet services : Building Internet Firewalls, 5.8.3. Installing and Modifying Services
modules, loadable : TCP/IP Network Administration, 5.2. Linux Kernel Configuration
monitoring
  automatically : Building Internet Firewalls, 5.9.2. Consider Writing Software to Automate Monitoring
  hardware for : (see detectors)
  intruders : Practical UNIX & Internet Security, 24.2.3. Monitoring the Intruder
  performance : Practical UNIX & Internet Security, 13.2.3. Performance Reviews and Monitoring
  security : (see logs/logging)
  software
    TCP/IP Network Administration, 11.9. Simple Network Management Protocol
    TCP/IP Network Administration, 12.4.3. Automated Monitoring
  system usage
    Building Internet Firewalls, 12.2. Monitoring Your System
    TCP/IP Network Administration, 5.2. Linux Kernel Configuration
  users : Practical UNIX & Internet Security, 26.2.6. Other Tips
monitors and screen savers : Practical UNIX & Internet Security, 12.3.5.2. X screen savers
more command : TCP/IP Network Administration, 8.4. Using nslookup
Morris worm : Building Internet Firewalls, 8.1. Electronic Mail
Morris, Robert T.
  Practical UNIX & Internet Security, 1. Introduction
  Practical UNIX & Internet Security, 8.6. The UNIX Encrypted Password System
  Practical UNIX & Internet Security, 17.4. Security Implications of Network Services
Mosaic
  Building Internet Firewalls, 2.5. The World Wide Web
  TCP/IP Network Administration, 13.1. The World Wide Web
motd file : Practical UNIX & Internet Security, 26.2.6. Other Tips
Motorola, Inc. : Practical UNIX & Internet Security, F.3.4.20. Motorola, Inc.
mount command
  Practical UNIX & Internet Security, 20.3. Client-Side NFS Security
  TCP/IP Network Administration, 9.1.3.1. The mount command
  Practical UNIX & Internet Security, 5.5.5. Turning Off SUID and SGID in Mounted Filesystems
mount daemon (mountd)
  Building Internet Firewalls, 5.8.2.4. Which services should you disable?
  TCP/IP Network Administration, 9.1.1. NFS Daemons
mount point : TCP/IP Network Administration, 9.1.3.1. The mount command
mounted filesystems
  Building Internet Firewalls, 5.8.4.3. Mount filesystems as read-only
  Practical UNIX & Internet Security, 5.5.5. Turning Off SUID and SGID in Mounted Filesystems
  TCP/IP Network Administration, 9.1.3. Mounting Remote Filesystems
  (see also directories)
mounting directory : TCP/IP Network Administration, 9.1. The Network File System
mpeg video subtype : TCP/IP Network Administration, 3.4.3. Multipurpose Internet Mail Extensions
mqueue directory : (see queue directory)
mqueue temporary files : TCP/IP Network Administration, 10.5.4. The Set Option Command
mrand48 function : Practical UNIX & Internet Security, 23.7.3. drand48 ( ), lrand48 ( ), and mrand48 ( )
mrouter
  Building Internet Firewalls, 6.3.3.5. IP over IP
  Building Internet Firewalls, 8.9.3. The Multicast Backbone (MBONE)
MRU (maximum receive unit) : TCP/IP Network Administration, A.2. The PPP Daemon
${ms} macro : sendmail, D.1. Sun Enhancements
msgid= equate (syslog output) : sendmail, 26.1.3.5. msgid= the Message-ID: identifier
MTAs
  Building Internet Firewalls, 8.1. Electronic Mail
  sendmail, 1.1. MUA Versus MTA
  sendmail, 5.3.1. Mail Delivery Agents
  sendmail, 6.2. Define a Mail Delivery Agent
  sendmail, 30. Delivery Agents
  (see also M configuration command)
  $# operator and
    sendmail, 9.2.1. The Delivery Agent ($#)
    sendmail, 28.6.5. Specify a Delivery Agent: $#
  advantages to sendmail : sendmail, 18.1. To Use or Not to Use
  choosing
    sendmail, 9. Rule Set 0
    sendmail, 9.5. Things to Try
  declaring : sendmail, 19.3.2. MAILER()
  default : sendmail, 34.8. Alphabetized Reference
  equates for : sendmail, 30.4. The Equates
  for errors : sendmail, 9.4. The error Delivery Agent
  expensive
    sendmail, 23.6.1. Periodically with -q
    sendmail, 30.8. Alphabetized F= Flags
    sendmail, 34.8. Alphabetized Reference
  flags
    sendmail, 6.3. The local Delivery Agent
    sendmail, 6.4. Add the Missing Parts to Mhub
    sendmail, 14.2. Headers Versus Delivery Agent Flags
    sendmail, 30.8. Alphabetized F= Flags
    sendmail, 35.4. ?flags? in Header Definitions
  ignoring MX records : sendmail, 21.3.5. What? They Ignore MX Records?
  local
    sendmail, 6.3. The local Delivery Agent
    sendmail, 19.6. Alphabetized m4 Macros
  logging : sendmail, 26.1.3.4. mailer= the delivery agent used
  printing list of : sendmail, 38.4.2. Show Delivery Agents with =M
  as recipients : sendmail, 30.8. Alphabetized F= Flags
  scripts via : sendmail, 24.3. Write a Delivery Agent Script
  statistics : (see statistics)
  symbolic name : sendmail, 30.2. The Symbolic Name
  testing : sendmail, 38.5.6. Try a Delivery Agent with /try
  UUCP : sendmail, 19.4.6. UUCP
mtime
  Practical UNIX & Internet Security, 5.1.2. Inodes
  Practical UNIX & Internet Security, 5.1.5. File Times
  Practical UNIX & Internet Security, 9.2.2. Checklists and Metadata
  Practical UNIX & Internet Security, 24.4.1.6. Changes to startup files
MTU (maximum transmission unit)
  Building Internet Firewalls, C.5.1.3. Fragmenting datagrams
  TCP/IP Network Administration, 1.5.1.3. Fragmenting datagrams
  TCP/IP Network Administration, 6.1.1. Determining the Interface Name
  TCP/IP Network Administration, 6.1.2. Checking the Interface with ifconfig
  TCP/IP Network Administration, 6.1.5.4. Maximum transmission unit
  TCP/IP Network Administration, A.1. Dial-Up IP
  determining smallest : TCP/IP Network Administration, 5.2. Linux Kernel Configuration
MUAs (mail user agents)
  sendmail, 1.1. MUA Versus MTA
  sendmail, 36.7. Alphabetized Reference
  (see also delivery agents)
MUDs (Multiuser Dungeons) : Practical UNIX & Internet Security, 17.3.23. Other TCP Ports: MUDs and Internet Relay Chat (IRC)
Muffet, Alec : Practical UNIX & Internet Security, 10.5.3.1. Beware false log entries
Multicast Backbone : (see MBONE)
multicast groups : Practical UNIX & Internet Security, 16.2.1.2. Classical network addresses
multicast IP : Building Internet Firewalls, 6.3.3.5. IP over IP
multicasting
  Building Internet Firewalls, 8.9.3. The Multicast Backbone (MBONE)
  TCP/IP Network Administration, 6.1.2. Checking the Interface with ifconfig
  TCP/IP Network Administration, 6.1.5.5. Point-to-point
  addresses
    TCP/IP Network Administration, 2.2.1. Address Classes
    TCP/IP Network Administration, 2.2.2.1. Final notes on IP addresses
    TCP/IP Network Administration, 2.6. Address Resolution
    TCP/IP Network Administration, 7.4.2. RIP Version 2
  routing, support for
    TCP/IP Network Administration, 5.2. Linux Kernel Configuration
    TCP/IP Network Administration, 5.3.1.1. Options
Multichannel Memorandum Distribution Facility (MMDF) : TCP/IP Network Administration, 10. sendmail
multicharacter
  names : (see names)
  options : (see options, sendmail)
MULTICS (Multiplexed Information and Computing Service) : Practical UNIX & Internet Security, 1.3. History of UNIX
multidirectional connections : Building Internet Firewalls, 7.4.2. Unidirectional Versus Multidirectional
multihomed
  hosts
    Building Internet Firewalls, C.5.1.2. Routing datagrams
    TCP/IP Network Administration, 5.3.1.1. Options
    TCP/IP Network Administration, 8.2.1. The Resolver Configuration File
    architecture of : TCP/IP Network Administration, 12.7. Firewalls
  site : TCP/IP Network Administration, 4.3.1. Obtaining an autonomous system number
multilevel security
  Practical UNIX & Internet Security, 1.3. History of UNIX
  Practical UNIX & Internet Security, 2.4.4.7. Defend in depth
  Practical UNIX & Internet Security, 2.5.3. Final Words: Risk Management Means Common Sense
  Practical UNIX & Internet Security, 17.2. Controlling Access to Servers
multimedia mail : (see email)
multipart content type : TCP/IP Network Administration, 3.4.3. Multipurpose Internet Mail Extensions
multipart encryption : (see encryption)
multipart messages : (see messages)
multiple
  recipients : sendmail, 30.8. Alphabetized F= Flags
  SMTP connections : sendmail, 34.8. Alphabetized Reference
  timeouts : sendmail, 34.8. Alphabetized Reference
multiplexing
  TCP/IP Network Administration, 2.1. Addressing, Routing, and Multiplexing
  TCP/IP Network Administration, 2.7. Protocols, Ports, and Sockets
Multipurpose Internet Mail Extensions : (see MIME)
multitasking
  Practical UNIX & Internet Security, 1.4. Security and UNIX
  Practical UNIX & Internet Security, C.1.3.3. Process priority and niceness
multiuser operating systems : Practical UNIX & Internet Security, 1.4. Security and UNIX
multiuser workstations : Practical UNIX & Internet Security, 17.3.21.1. etc/fbtab and /etc/logindevperm
munitions export : Practical UNIX & Internet Security, 26.4.1. Munitions Export
MustQuoteChars option : sendmail, 34.8. Alphabetized Reference
MX records
  Building Internet Firewalls, 8.10.5.1. Set up a `fake'
  Practical UNIX & Internet Security, 17.3.6. Domain Name System (DNS) (TCP and UDP Port 53)
  sendmail, 15.3. MX Records
  sendmail, 18.8. Alphabetized Reference
  sendmail, 21.3. Set Up MX Records
  sendmail, 34.8. Alphabetized Reference
  sendmail, 38.5.2. Look Up MX Records with /mx
  TCP/IP Network Administration, 8.3.2. Standard Resource Records
  TCP/IP Network Administration, 8.3.6. The named.hosts File
  TCP/IP Network Administration, 8.4. Using nslookup
  TCP/IP Network Administration, 10.7.1. Modifying Local Information
  TCP/IP Network Administration, C.3.1.4. Mail exchanger record
  0 flag : sendmail, 30.8. Alphabetized F= Flags
  bestmx database class : sendmail, 33.8. Alphabetized Reference
  bestmx_is_local feature : sendmail, 19.6. Alphabetized m4 Macros
  fallback MX host : sendmail, 34.8. Alphabetized Reference
  ignored by delivery agents : sendmail, 21.3.5. What? They Ignore MX Records?
  looking up for addresses : sendmail, 21.2.3. Look Up Addresses for Delivery
  offsite hosts : sendmail, 21.5.1. Offsite MX Hosts
  with wildcards : sendmail, 21.3.4. Wildcard MX Records
/mx rule-testing command : sendmail, 38.5.2. Look Up MX Records with /mx
MYNAME= command : Practical UNIX & Internet Security, 15.5.2. Permissions Commands

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