I have already been using postscreen for port 25. smtp inet n - y - 1 postscreen smtpd pass - - y - - smtpd dnsblog unix - - y - 0 dnsblog tlsproxy unix - - y - 0 tlsproxy submission inet n - y - - smtpd Thank you anyway.
Use postscreen on port 25, it will drop many bots from trying to connect and send mail through your server.
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