Re: [Exim] Example of legit email rejected by testing on rev…

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Author: Giuliano Gavazzi
Date:  
To: exim-users
Subject: Re: [Exim] Example of legit email rejected by testing on reverse IP lookup
At 16:22 +0530 2002/12/08, Suresh Ramasubramanian wrote:
>On Sun, 2002-12-08 at 16:13, Matthew Byng-Maddick wrote:
>
>>  > It means - you are in a customer IP block, most likely dynamic IPs.
>>  > So, he is asking you to set up your exim to smarthost through your
>>  > provider's mailserver.
>>  > > <h-64-105-159-234.PHLAPAFG.covad.net[64.105.159.234]>:
>>  > >     Client host rejected: mail from domains with generic/dialup/DHCP
>>  > > addresses is not accepted - contact your ISP for support

>>
>> Yes, indeed.
>>
>> Smarthost through your provider.
>
>As long as the IP is static I have no problems with accepting mail from
>that netblock in general (except in cases where there is more than a few
>spam sources from a single /24 of such IPs).
>
>Dynamic IPs on the other hand deserve to be blocked wholesale. Ditto
>with NAT gateways like some idiot cablemodem providers run (allotting
>their users RFC1918 addresses and NATting all outbound traffic through
>one or more IPs).
>
>    srs


the same here, I would not have blocked the above if the HELO
argument had been in the same domain as the reverse lookup, after all
what's the point pretending to be something else since that is what
most spammers but very few bona fide servers do?

Giuliano
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