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From: Viktor Dukhovni (postfix-usersdukhovni.org)
Date: Thu Dec 05 2013 - 10:06:23 CST
On Thu, Dec 05, 2013 at 08:23:18AM +0100, Matteo Cazzador wrote:
> " hostname ... server refused to talk to me: 550 Denied by policy"
Note, some time ago there were systems (perhaps Microsoft Exchange)
that returned 5xx codes in the SMTP banner due to high load (rather
than a permanent error condition). They may still be present in
sufficient numbers to make defer on 5xx banner the safer choice.
> My problem is that the sender isn't warned of mail server error.
> The sender don't receive immediatly any error message, why?