Returned in a non-delivery notification. Like this:
Remote host said:
550 Spam not accepted.
[BODY]
________________________________
From: Wietse Venema <wie...@porcupine.org>
To: J. <sweeping...@yahoo.com>
Cc: "postfix-us...@cloud9.net" <postfix-us...@cloud9.net>
Sent: Tuesday, November 4, 2014 12:19 PM
Subject: Re: header checks/body checks
J.:
> I'm using header_checks and body_checks to block certain classes
> of spam that amavis/sa don't seem to be able to catch. The trouble
> is that when it rejects the message, the message failure text is
> sent followed by:
Sent as in:
[ ] Returned to the SMTP client?
[ ] Returned in a non-delivery notification from your Postfix server?
[ ] Logged to the system logfile?
[ ] ????
Wietse
