We have creates an smtp server for our webapps.
This server runs Under Ubuntu with Postfix and Opendkim. We have 40 domains with 40 DKIM keys. My config is the same as described in this blog post
It works just fine.
My problem : If developers create an email with a domain my server doesn't know in the trusted list, it will send it, and block the mail in between 2 and 3 minutes.
Can I do something to make postfix reject untrusted mails immediately?
I've tried in
ADSPAction=reject. My mails are rejected, but still waiting in the queue for 2-3 minutes.
I've found nothing usable in Postfix to block these domains.