Re: About 'connect from unknown[IP address]' -> reject_unknown_reverse_client_hostname

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Re: About 'connect from unknown[IP address]' -> reject_unknown_reverse_client_hostname

Bruno Costacurta
...
> Ýou mean *client*.
>     smtp_client_restrictions = reject_unknown_client_hostname
>
> NOTE that this is a very heavy restriction and will cause many, many
> false positives.
>

I'll use warn-if-reject to see how is going.

> Instead, use the milder (but equally effective)
>     smtp_client_restrictions = reject_unknown_reverse_client_hostname
>
> This will reject all clients that do not have a PTR entry for their IP.
>
> See http://www.postfix.org/postconf.5.html#smtpd_client_restrictions for
> the full list.
>

I implemented your recommended milder setup.
Thanks.
Bruno