Poste.io tries to log as much as possible. There are a few places where you can find valuable logs for debugging:
docker logs --tail=100 mailserverthere should be all the information about starting and stopping services.
/your-data-dir/logsits essentially a copy of /var/log from the inner container. There are a few special directories in addition to the standard ones:
- admin-app - web administration errors log
- delivery - all email delivery logs should be logged there
- dmarc - received DMARC reports
- s6 - contains output from supervised services
/your-data-dir/domains/domain.com/username/.dovecot.sieve.logwhenever the sieve script fails, the error should be logged in this file in the user's mailbox directory
PRO version allows you to browse delivery logs via web administration.