anantisac.gov.in
Date: Sun Nov 12 2006 - 02:50:54 CST

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Dear Jorey:

Thanks.

I know, it will be a very strict rule. But, do you think, will the
reject_unknown_client_hostname rule need to be applied to implement it?

We are already using rule: reject_unknown_hostname. And we find that,
lot of SPAM is getting filtered through this (with some exceptions).

Regards,
Anant.

Quoting Jorey Bump <listjoreybump.com>:

> anantisac.gov.in wrote:
>> Dear Sandy:
>>
>> Thanks for your reply, and my guess was right. Now, is there a way
>> to implement something like this:
>>
>> The mailer says, I am a.b.c and is resolvable in DNS with some IP.
>> Can we do a reverse lookup to make sure that it is the same using
>> POSTFIX?
>>
>> If there is such an option, I would like to implement it.
>
> Why? You will reject an enormous amount of legitimate mail with such a
> policy. It's not a reasonable expectation that a reverse lookup on an
> IP address should match the resolvable hostname used in the HELO. Too
> few organizations have either the ability or permission to create PTR
> records for the IP addresses they use.

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