Postfix

References

• Postfix Configuration Parameters.

• local_recipient_maps
• luser_relay

• ADDRESS_REWRITING_README — Postfix Address Rewriting
• LOCAL_RECIPIENT_README — Rejecting Unknown Local Recipients with Postfix

Installation

Server

TBC

SRS

See Configuration Noekeon.org.

DKIM

See this excellent guide on digitalocean.com.

DMARC

See dmarc.org. DMARC is suggested by GMail Bulk Senders Guidelines.

Aliases

Add static aliases in default configuration

• Edit /etc/aliases
• Then run newaliases:

newaliases

Uses regexp (dynamic) aliases

Edit file /etc/postfix/main.cf as follows [1]:

alias_maps = regexp:/etc/postfix/aliases-regexp

Then create /etc/postfix/aliases-regexp as follows:

/^tom\..*@domain.com$/     tom@other.com
/^phil\..*@domain.com$/    phil@other.com

Troubleshooting

Debugging aliases

Use postmap:

postmap -q mip@prime.immie.org hash:/etc/aliases regexp:/etc/aliases-regexp
postmap -q mip hash:/etc/aliases regexp:/etc/aliases-regexp

Handling deferred mail / message queue

Reference:

• Inspecting Postfix’s email queue

View the queue

mailq                        # ... or ...
postqueue -p

View a message

postcat -vq XXXXXXXXXX       # Replace XXXXXXXXXX with message ID

Process the queue now

postqueue -f                 # ... or ...
postfix flush

Delete the queue

postsuper -d ALL
postsuper -d ALL deferred    # Delete only deferred messages