autoexpunge not work

[rino1]

$ docker compose config mail-server | grep image
    image: mailserver/docker-mailserver:15.1.0
 
$ docker compose run --rm mail-server 
    grep -H --before-context=3 autoexpunge \
        /etc/dovecot/conf.d/15-mailboxes.conf
/etc/dovecot/conf.d/15-mailboxes.conf-  mailbox Sent {
/etc/dovecot/conf.d/15-mailboxes.conf-    auto = subscribe
/etc/dovecot/conf.d/15-mailboxes.conf-    special_use = \Sent
/etc/dovecot/conf.d/15-mailboxes.conf:    autoexpunge = 1d
 
$ docker compose exec mail-server doveconf -n | grep -A3     "mailbox Sent"
  mailbox Sent {
    auto = subscribe
    autoexpunge = 1 days

But the Sent directory contains messages older than a day.

Why?

[polarathene]

Why?

Unknown. I would have to take time to reproduce and troubleshoot on your behalf, but I do not have the time right now.

A quick search query on Google suggests that you must login/access the mailbox via IMAP/POP3 for that feature to be triggered, inactivity doesn't automate cleanup while away apparently.