Server-based mail processing
Goal
Filter mails from inbox on different folders as they arrive. This is to keep an uncluttered inbox even when subscribed to multiple mail lists.
Procmail looks useful but it's unmaintained.
Category
Email Infrastructure
Alternatives
Courier Maildrop
On Dovecot Wiki
https://wiki.dovecot.org/maildrop
Url
https://www.courier-mta.org/maildrop
Maildrop on Postfix
http://www.postfix.org/MAILDROP_README.html
Postfix .forward
This cannot be used for classification, only for forwarding.
Sieve
Wiki
http://sieve.info/
Is
A standard filter definition language, with multiple implementations, such as a plugin on the Dovecot LDA (local delivery agent).
RFC
Sieve language
RFC 5228
ManageSieve protocol
RFC 5804
Example scripts
http://sieve.info/examplescripts
Used on
Private server - Mail classification
On dovecot
Sieve plugin for Dovecot
https://pigeonhole.dovecot.org/
On Dovecot wiki
https://wiki2.dovecot.org/Pigeonhole/Sieve
(nmh) New Message Handler
On ArchWiki
https://wiki.archlinux.org/title/Nmh
A client