Postfix

About

Postfix is an open source mail transfer agent (MTA) for POSIX systems. It is fully supported by Webmin/VirtualMin and is part of the Dovecot stack.

Pages

• /aliasing: managing email redirects/aliases
• /fixing: diagnosis of installations that aren't working right
• see also: DKIM, DMARC, Sender Policy Framework (SPF)

Files

• /main.cf
• /master.cf: formatted list of transport helper applications
• /mail.log (typically found in /var/log)

Internal Apps

• /aliases (reference)
• /cleanup (reference)
• /lmtp (reference)
• /local (reference)
• /pickup (reference)
• /qmgr (reference)
• /smtpd (reference)
• /transport (reference)
• /trivial-rewrite (reference))

User Applets

• /newaliases

Other Applets

These are installed as part of the postfix package; not sure how they should be classified:

/usr/bin: /mailq /newaliases - user utility /rmail /usr/lib: /postfix_groups.pl /sendmail

/usr/lib/postfix: /anvil /bounce /cleanup /discard /error /flush /fsstone /lmtp /local /master /oqmgr /pickup /pipe /post-install /postfix-files /postfix-script /postfix-wrapper /postmulti-script /proxymap /qmgr /qmqpd /scache /showq /smtp /smtpd /spawn /tlsmgr /trivial-rewrite /verify /virtual

/usr/sbin: /postalias /postcat /postconf /postdrop /postfix - core binary /postfix-add-filter /postfix-add-policy /postkick /postlock /postlog /postmap /postmulti /postqueue /postsuper /qmqp-sink /qmqp-source /qshape /rmail /sendmail /smtp-sink /smtp-source

Error Messages

• 503 5.5.1 Error: authentication not enabled
• Connect to private/dovecot-auth failed: No such file or directory

Other Subpages

• /flow: the flow of messages across the various helper programs that make up Postfix
• /SSL: Postfix and SSL

Notes

After making changes to the Postfix configuration files, you don't actually have to stop and restart Postfix to load the changes; you can just type (as root) "postfix reload".

automatic BCC

To automatically BCC outgoing mail from any given set of users, set sender_bcc_maps in /main.cf to hash:/etc/postfix/sender_bcc. (In Webmin: BCC Mapping: Sender BCC mapping lookup tables)

Each line in the /sender_bcc file will contain the sender (which can be user@domain, user, or @domain), one or more blanks, then the recipient (which can be one address or multiple addresses separated by commas).

Example -- BCCs all mail sent by vbz.com users to an archive address:

@vbz.com archive2024@vbz.com

pages to index

Possibly useful pages:

• Setting Up Postfix As A Backup MX
• Postfix Address Rewriting
• trivial-rewrite (manpage)
• Postfix Configuration Parameters (includes /main.cf parameters)
• Postfix After-Queue Content Filter
• Group-Office Mailserver plugin: helps administer Postfix
• Mail server using Postfix and Dovecot on Gentoo Linux

Links

Official

• home page
• manpage

Reference

• Wikipedia