From: Sandy Drobic (postfix-usersjapantest.homelinux.com)
Date: Thu Nov 02 2006 - 16:53:27 CST

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mouss wrote:
> Sandy Drobic wrote:
>>
>> Unfortunately, not dns a record exists for tara2.wa.amnet.net.au.
>> reject_unknown_hostname
>
> you mean reject_unknown_client.

Correct.

>> will reject all clients that do not have a matching forward and
>> reverse dns record. See details here:
>> http://www.postfix.org/postconf.5.html#reject_unknown_client_hostname
> same as above.
>>
>> Be careful with all checks that have "unknown" in their name. They are
>> likely to reject desired mails.
> Don't generalize. reject_unknown_sender_domain should be safe (you can't
> bounce nor reply, why take it?). reject_unknown_client is more or less
> acceptable ( ahost with bad rdns has nothing to do on the internet).

While I agree to your assessment of "reject_unknown_sender_domain" I
disagree with your statement about hosts with no reverse_dns. Sometimes
you don't have a choice which isp you have to use and sometimes they don't
heed to your requests. I have that trouble with a lot of chinese servers,
and the complaints of the british BT customers are also well-known.

I guess it would be nice if every mailserver would implement the basic
requirements, but unfortunately we do not live in such an ideal world, so
it often takes less effort and time to simply whitelist a server or even
not use such a check.

Sandy
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