I ran into this problem as well, and fixed it via

default_login_user = vmail
default_internal_user = vmail
default_internal_group = vmail


I think the recommendation is to use the new conf.d/ directory to selectively amend the standard configuration (which would have prevented running into this issue), but it requires thoughtful changes so it requires time and work to migrate.


On 26/01/2025 11.06, Andreas Achtzehn via dovecot wrote:
Dear Dovecot team,

I ran into troubles using the newly released 2.4 docker image.

The dovecot/dovenull users are apparently not part of the image -- hence the dovecot server fails to start up with a fatal error.

I'm using a vanilla configuration, default_login_user, etc. are not set.

Thanks for having a look!

Best regards,

Andreas

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