On 14/03/18 15:51, li...@lazygranch.com wrote:
> I'm getting hit every 10 minutes from this spammer. As you can see I am
> rejecting the message. I wonder if the offending email server doesn't
> know the message is being rejected? 
> Mar 13 23:28:58 centos-1gb-sfo1-01 postfix/smtpd[22153]: NOQUEUE:
> reject: RCPT from unknown[]: 450 4.7.1 Client host
> rejected: cannot find your reverse hostname, [];
> from=<sale...@tradepro.net> to=<li...@lazygranch.com> proto=ESMTP
> helo=<mail.port25.com>

That's not a reject, it's a defer (4xx) code which specifically means
that you're telling the remote server to try again.  Spam or not the
remote server is doing what you're telling it to do.


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