Configuring Postfix to use SASL Authentication

Description:

Mstar.net requires mail clients to use authentication in order to send mail.
This document details how to configure a Linux machine to send mail through
mail.mstar2.net using postfix and SASL authentication (also known as SMTP
AUTH).

Assumptions:

1. Computer is running the postfix mail program (a secure sendmail replacement)
2. postfix was compiled with SASL authentication support. The postfix that
   comes with Red Hat 8.0 has SASL enabled.
3. I am using an account on my home machine that is NOT the same username ad
with my ISP. My local username is 'jaredrob'.

Steps:

A. Edit postfix configuration files and add the following:

  /etc/postfix/main.cf:

    relayhost = mail.mstar2.net
    enable_sasl_authentication = yes
    smtp_sasl_auth_enable = yes
    smtp_sasl_password_maps = hash:/etc/postfix/sasl_passwd
    smtp_sasl_security_option =
    sender_canonical_maps = hash:/etc/postfix/sender_canonical
  
  /etc/postfix/sasl_passwd:

    mail.mstar2.net	my_ISP_username:my_ISP_password

  /etc/postfix/sender_canonical:

    jaredrob     myUserName@mstar2.net

  /etc/aliases

    root:	jaredrob@localhost

 . Run the following commands:
  chmod o-r /etc/postfix/sasl_passwd
  postfix check
  postmap /etc/postfix/sasl_passwd
  postmap /etc/postfix/sender_canonical
  postfix reload
  tail /var/log/maillog  # use this to see error messages

Helpful postfix SASL links:
  http://sdb.suse.de/en/sdb/html/rsimai_imap_smtp_auth.html
  http://www.postfix.org/smtpd.8.html

RFC links:
  SASL:           ftp://ftp.isi.edu/in-notes/rfc2222.txt
  SMTP AUTH:      ftp://ftp.isi.edu/in-notes/rfc2554.txt
  Anonymous SASL: http://www.faqs.org/rfcs/rfc2245.html