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.

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