From: LuKreme (kremelskreme.com)
Date: Tue Jun 23 2009 - 01:58:11 CDT

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On 22-Jun-2009, at 18:29, mouss wrote:
>> Is there anyway to, if not outright reject anyone whose DNS shows
>> up as
>> unknown to at least tempfail them with a "Ooops, your DNS is not
>> resolving, try back later" or something?

> if you insist, you could use one of
>
> http://www.postfix.org/postconf.5.html#reject_unknown_reverse_client_hostname
> http://www.postfix.org/postconf.5.html#reject_unknown_client_hostname
>
> but use at your own risks. In particular,
> reject_unknown_client_hostname
> (previously: reject_unknown_client) _will_ block or delay legitimate
> mail.

Will it block or delay it? Can I set the error code to a tempfail
instead of a outright rejection. Blocking legitimate mail that fails
dns checks is one thing, rejecting it outright is another thing
altogether.

>> Seems at least half the spam that gets by zen shows up as
>> client=unknown
>
> how much is half of what...

I don't understand the question.

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  of our language.

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