courier 0.47 - BOFH mail filters

Maximum recipients

Maximum recipients per message:

Bounce additional recipients, instead of deferring them

Blocked return addresses

Reject all mail carrying the following return addresses:

Blocked mail relays

Reject all mail with a return address in any domain that receives mail via the following mail relays:

Freemail

Reject all mail with the return address in the following domains, unless the mail relay's IP address is resolved in the same domain:
(additional domains authorized to send using this return address)

Spamtraps

Reject all mail addressed to the following recipients. Note - specify a local mailbox by appending "@servername" (see "Mail server name and local domains"):

Default handling of corrupted/invalid MIME-formatted mail