New antispam features in Sendmail 8.14.0 and above

I have not paid attention to some new important antispam features offered by Sendmail in version 8.14.0 or above. They are :


This is to reject messages from SMTP clients whose IP address does not have proper reverse DNS.


This is to reject messages from SMTP clients which provide a HELO/EHLO argument which is either unqualified, or is one of our own names (i.e., the server name instead of the client name).


The function is to reject envelope sender addresses (MAIL) whose domain part resolves to a "bad" MX record.

I recommend all network administrators who manage Sendmail must enable these antispam functions.

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