Unable to send email even when authenticated

[imro2]

I just spent hours researching this. Could not send email if even when SASL authentication succeeded. I was getting Client host rejected: Access denied; and reviewed all the polices I copied from the example. I could not come up with a reason. Only after adding POSTFIX_debug_peer_list: host-from-which-i-am-sending.com did I get a clue.

It turned out to be the this default (for this docker) policy:

smtpd_client_restrictions=permit_mynetworks,reject

It would be great if permit_sasl_authenticated was part of the policy by default so other people don't have to go through this.

I solved it for my self by adding this to my docker-compose:

POSTFIX_smtpd_client_restrictions: "permit_mynetworks, permit_sasl_authenticated, reject"

Hopefully it will help other searching for a similar issue.

[bokysan]

Hm, you are correct. That change would make sense. Thanks for the comment.