LinuxCBT - Postfix Edition

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Genre: eLearning

Postfix - Installation

Identify a geographically close Postfix mirror location

Discuss Postfix nomenclature

Download Postfix

Import PGP-compatible key to verify downloaded source archive

Verify Postfix source archive against imported signature

Extract Postfix source archive

Identify existing system MTA configuration

Explore Postfix source tree

Discuss pre-requisites

Identify Sendmail-compatible binaries to backup

Add required Postfix user and groups

Compile & install Postfix

Identify key directories and binaries

Alter key Postfix configuration files for basic operation

Postfix - Local Mail & Queueing

Define local domains in main configuration file

Define Fully Qualified Domain Name (FQDN) of Postfix Host

Confirm running Postfix TCP (super server) Manager

Explore current running directives with postconf

Alter configuration to enable local aliases

Use sendmail-compatible binary to inject messages into the local queue

Confirm delivery via default Syslog location

Identify default mbox-based mailstore

Use MUA mutt to verify delivery of local mail

Discuss & explore various Postfix queues

Explain how Postfix implements local injection

Explain how Postfix handles SMTP-based mail

Postfix - Aliases

Discuss concepts and applications for aliases

Identify required aliases

Describe Sendmail-compatible alias types

Define 1-to-1 aliases

Define list-based aliases

Test aliases delivery

Discuss per-user aliases (.forward) file

Define per-user .forward file with redirection to vacation program

Test delivery and auto-response

Discuss how mail is routed into the file system (maildrop) while Postfix is up/down

Identify binaries responsible for local mail injection (pickup/cleanup)

Postfix - Simple Mail Transfer Protocol (SMTP)

Confirm the existence of remote recipients

Inject mail for delivery to remote Linux Host

Review Postfix delivery report generated upon invocation of verbose mode

Confirm delivery of remote mail to remote Linux Host

Use MUA mutt to reveal and explore the headers of SMTP-based mail

Explore name resolution order file & discuss logic

Configure Postfix to receive mail to second-level domain plus FQDN

Simulate Postfix name resolution process at delivery-time

Expose current Mail Exchanger (MX) Host for the second-level domain

Postfix - Rewriting Features - Canonical Maps - BCC Maps

Discuss default configuration

Examine envelope headers

Configure Postfix to masquerade outbound messages

Test masqueraded envelope by generating new mail

Discuss canonical maps concepts & applications

Explain corresponding rewrite binaries

Define canonical maps in Ascii format

Use Postmap to generate DB-formatted canonical maps

Instruct main.cf to employ canonical maps database

Test address rewriting using canonical maps

Confirm message delivery via Syslog-generated logs

Examine the headers of delivered message altered using canonical maps & myorigin

Define & test sender canonical maps

Define & test recipient canonical maps

Configure Postfix to BCC all messages to specified recipients

Test messages between various users to ensure BCC functionality

Configure Postfix to BCC messages based on specific senders

Define Sender BCC maps using editor and Postmap to generate Hashed DB

Postfix - Relay Control

Explore & discuss default relay behavior

Identify key relay-related directives

Connect to remote Windows 2003 Host and attempt to relay

Confirm DNS resolution of Postfix relay host

Attempt relay to recipient on relay host & confirm path via logs

Attempt relay to recipient on foreign host & confirm delivery

Tighten default Postfix relay policy to restrict relaying to local subnet

Attempt local subnet and Internet-based relays & confirm results

Use SMTP commands to expose features supported by Postfix MTA

Discuss SMTP Auth pre-requisites

Recompile Postfix to support SMTP Auth

Configure Postfix with SMTP Auth to restrict relaying by users vs. IP or hostname

Confirm support of SMTP Auth using standard STMP commands

Configure Outlook Express client to support SMTP Auth

Attempt to relay based on SMTP Auth support

Permit relaying of non-local domains based on relay domains

Define additional second-level domain for relaying

Configure relaying of non-local domains using hashed Berkeley DB maps

Discuss Postfix transport maps concepts and applications

Define transport maps for domains to bypass DNS MX lookups

Update receiving Postfix host to support transport maps

Confirm delivery of messages to additional domains defined in transport maps

Configure Postfix as a Backup Mail Exchanger (MX) host and confirm delivery during failure

Postfix - Smart Host & Null Client configuration

Discuss Smart Host concepts and applications

Define the Postfix Smart Host

Define the Postfix Smart Host client

Test local delivery and confirm delivery

Test delivery of Internet-based message which requires Smart Host

Confirm delivery via logs and remote SSH session

Discuss Null client concepts and applications

Internet -> DMZ -> Corporate Backbone Mail Repository

Disable local mail delivery on Postfix host

Configure Postfix to function as a null client

Test results of null client delivery

Postfix - Virtual Domains

Discuss default domains handled by Postfix

Attempt IP-address based delivery

Explore the mydestination parameter

Alter BIND configuration to route messages for basic virtual domain

Configure Postfix to map individual users to domains

Define individual virtual domains hash

Define virtual domains user hash

Generate hashed virtual domains and virtual user databases

Confirm routing of messages to appropriate users

Define catchall addresses for non-matching users and/or aliases

Use Postmap to query virtual users and determine delivery path

Postfix - Mailbox Formats

Explore default mbox configuration location and permissions

Describe mbox format

Explore environment configuration variables related to mail delivery

Test delivery of mbox-bound messages using mutt & Postfix

Discuss Maildir message storage format

Configure Postfix to deliver messages using Maildir message format

Examine Postfix-created Maildir structure after mail delivery

Alter shell environment to support Maildir format with desired MUA

Postfix - Network-based Mail Retrieval

Discuss Courier IMAP framework

Identify and install pre-requisites

Download, compile, and install Courier Authentication Library Daemon

Identify Courier Authentication key directories, binaries and configuration file

Download and install Courier IMAP Daemon

Explore Courier IMAP binary directory tree

Discuss Courier framework

Configure Courier for POP3 mail retrieval

Confirm retrieval using Windows 2003 - Outlook Express client

Identify POP3 Secure configuration files

Generate self-signed certificate for use with POP3 Secure communications

Confirm retrieval of messages using Outlook Expres and POP3 Secure

Establish run-level symbolic links for POP3 & POP3S services

Configure Courier for IMAP mail retrieval

Confirm retrieval using Windows 2003 - Outlook Express client

Generate self-signed certificate for use with IMAP Secure communications

Establish run-level symbolic links for IMAP & IMAPS services

Postfix - Web-based Mail Retrieval

Discuss Web-based SquirrelMail pre-requisites

Enable Apache web server

Download and Install SquirrelMail into web-accessible location

Secure data and attachments directories

Configure SquirrelMail for initial use with Courier IMAP

Address PHP session-related issues

Explore SquirrelMail from the browser as various Linux users

Confirm deliver using multiple clients - (mutt/Outlook Express/SquirrelMail/Local Injection)

Postfix - Malware Framework

Dowload MailScanner

Download Clam Anti-Virus (ClamAV)

Download SpamAssAssin

Download, compile & install zlib

Clam Anti-Virus (ClamAV) Implementation

Create required user and group

Compile & install ClamAV

Identify key ClamAV binaries

Update ClamAV configuration files for basic operation

Update ClamAV definitions

Configure system Crontab to update virus definitions every hour

Confirm scheduled virus definition updates 24 hours later

SpamAssAssin Implementation

Illustrate message flow from remote SMTP system through our Malware Framework

Download SpamAssAssin from Apache Foundation

Extract & discuss SpamAssAssin source tree

Compile and install Perl-based SpamAssAssin

MailScanner Implementation

Download, compile and install the current MailScanner malware engine

Explore MailScanner source and binary trees

Explore MailScanner.conf configuration file - discuss important directives

Update MailScanner to support Postfix MTA

Configure Postfix MTA to route inbound messages into temporary queue for processing

Invoke MailScanner malware engine and confirm

Debug incidentals related to invalid configuration directives and missing components

Malware Framework - MUA -> MTA -> MailScanner -> ClamAV -> SpamAassAssin -> MTA -> Maildir/Mailbox

Send sample malware through the malware framework & confirm detection

Send sample spam through the malware framework & confirm detection

Configure MailScanner to affix outbound Corporate Signatures - Legalise - to all messages based trusted configuration

Postfix - Log Analysis

Download AWStats log analysis application

Configure AWStats to function in current Apache Web Server environment

Discuss AWStats features and applications

Configure AWStats to process Postfix MTA Logs

Explore AWStats' web-based interface

Postfix - Transport Layer Security (TLS)

Discuss benefits

Obtain latest sources

Configure TLS support

Confirm secure message delivery

Evaluate results

Postfix - SMTP AUTH - Dovecot

Discuss benefits

Configure SMTP Auth & TLSsupport

Authenticate client requests

Confirm secure message delivery

Evaluate results

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