Feb. 9, 2026
4:50 p.m.
That is the piece I am having a hard time finding. The reason is gmail rejecting the authentication. What I can't seem to tell is what gmail user postfix is trying to use. I THINK the debug info is saying it is using llllllllll-bounces@gmail.com (although there is no real reason why authentication should fail for that either). I cannot find where it tries to use llllllllll@gmail.com which is what it is supposed to use. As I said using smtp_sender_dependent_authentication makes the difference.