On Sun, Jul 19, 2015 at 10:08:07PM -0500, John Gateley wrote:
> I have a host running postfix on port 25 (also 12345 for debugging
> purposes[*]),
> and I want to test the following line in my main.cf:
>
> smtpd_client_restrictions = reject_unknown_client_hostname
You can save yourself some time by not doing that. Too many
false positives. Instead consider:
reject_unknown_reverse_client_hostname
http://www.postfix.org/postconf.5.html#reject_unknown_reverse_client_hostname
Which is reasonably safe for most users.
--
Viktor.
