On Mon, 6 Apr 2015, John Meissen wrote: > If I'm not mistaken Postfix and Sendmail can be directly configured to > reject based on no reverse-DNS.
Yep. In /etc/postfix/main.cf there's a section
smtpd_recipient_restrictions =
which includes this line:
reject_unknown_reverse_client_hostname,
along with a bunch of others.
Rich
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