I added a new domain relay.com which uses the option
Relay this domain and
Relay all recipients.
Everything received should be relayed, so I created a Transport Map with destination
.*relay\.com and the Next hop of another Postfix server.
When sending an E-Mail to eg. email@example.com i get following error in the Mailcow Postfix Logs:
27DF9EAAC8: to=<firstname.lastname@example.org>, relay=none, delay=61, delays=1/0.02/60/0, dsn=4.4.1, status=deferred (connect to hostname-of-mailcow.example.com[184.108.40.206]:25: Connection timed out)
Happy about any ideas. Thanks!