Postfix

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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)
/chroot: running Postfix in a chrooted environment

Files

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

Internal Apps

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

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

Reference

Wikipedia