Originally Posted by till
Please post the exact error message that you got in the mail log.
I do not receive any error message, nothing appears.
Anyway I've just received this message (bounce email) :
The problem is that the code is 450 (temporary failure) and the delay seems to be serveral days. I've modified postfix main.cf file to include these lines:
unknown_local_recipient_reject_code = 550
So that in this case the bounce mail should be sent immediatly. But after a restart, it still doesn't work and in the log it's still the error code 450.