I couldn’t find anything about this in the manuals, so I decided to ask here. Is there a way to automatically delete emails older than N days in a specific mailbox? Or can this only be done using external clients?
EnglishDelete mail in mailbox older than N days
You can configure and automate it on the hostsystem by using cron: 
Expunge a Users mails - mailcow: dockerized documentation docs.mailcow.email
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pkernstock Oh, thank you for such a fast reply! I didn’t even think to look for it in the Dovecot section or consider using cron. ))
Personally, I’m using these cronjobs to purge old emails:
# Delete mails from junk which are read and older than 4 weeks
/usr/local/bin/docker-compose exec -T dovecot-mailcow doveadm expunge -A mailbox 'Junk' SEEN savedbefore 4w
# Delete mails from junk which are NOT read and older than 8 weeks
/usr/local/bin/docker-compose exec -T dovecot-mailcow doveadm expunge -A mailbox 'Junk' not SEEN savedbefore 8wNo one is typing