Hi,
In a fresh mailcow installation, I have a strange situation.
primary domain is shortname.cloud with 2 alias domains longername.net and longername.com
configured so that a user from shortname.cloud can mail out with all 3 names.
all 3 domains have dkim keys inserted in DNS.
if I mail out with either shortname.cloud or longername.net, all is good. However, when mailing out from longername.com the email address gets rewritten to <user>@longername.NET. That of course breaks the DKIM setup.
Any idea why this is happening and how to start debugging this behavior in the docker environment?
Thanks,
P.