On 3/13/2018 10:51 PM, 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>

Have you looked at something like fail2ban that can automate an iptables

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