My hosted email server is "Refusing to talk : 550" with my postfix server.
Gmail, Yahoo, Hotmail all accepts them fine. All of sudden hosted email provider decided not accept email from my server. I dont really know why... i dont send out spam nor have large volumes.
Anyways, now they want me to get a bounce-back email.
All the email in question are in mailq (deferred)
How do I expire them so that postfix will send out "unable to send" to mail clients who sent them?
I dont want to delete them...
Thanks for the help in advance
Answer
Use postqueue -f as root to flush the entire queue; this will cause delivery to be re-tried.
If the remote server really reports a 550, then the messages will not be deferred; they will be rejected, and your postfix server will instantly bounce them.
If this does not seem to be happening, make sure you do not have soft_bounce = yes set:
postconf soft_bounce
On any production server, the soft_bounce setting needs to be no.
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