[ANNOUNCE] dovecot_spam_report - non-blocking spam/ham learning (IMAPSieve + sa-learn)

Hi all,

I would like to announce dovecot_spam_report, a small GPL tool that decouples spam/ham reporting via IMAPSieve from sa-learn, so Dovecot no longer blocks while messages are being learned.

Download: https://inf-it.com/dovecot_spam_report.tgz

The problem

The usual setup ("Replacing antispam plugin with IMAPSieve", https://doc.dovecot.org/latest/core/config/spam_reporting.html) pipes every message moved into or out of Junk directly to sa-learn, and the IMAP process waits for sa-learn to finish for each message. The HOWTO itself warns that this can lock the user out for tens of seconds or minutes; with bulk moves of thousands of messages it gets much worse.

JM