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From: Jason Bailey, Sun Advocate Webmaster (webmastersunad.com)
Date: Wed Jun 23 2010 - 11:12:01 CDT
On 06/22/2010 10:56 PM, Stan Hoeppner wrote:
> Jason Bailey, Sun Advocate Webmaster put forth on 6/22/2010 10:32 PM:
>> (Note: I do have to disclose one piece of information. Recently our
>> server was automatically blacklisted by our ISP for spam that was being
>> relayed through our system from a series of external sources. I've
>> tested both servers against online open relay tests and performed my own
>> internal tests at times to prevent relay of spam, so I can't say why
>> they were able to relay. I ended up basically rewriting the
>> smtpd_client_restrictions, smtpd_receipient_restrictions and
>> smtpd_sender_restrictions lists. The relayed spam stopped and our ISP
>> finally removed us from their blacklist)
> If the problem you describe started after this blacklisting, and you had none
> of these delivery problems before said blacklisting occurred, doesn't it seem
> pretty obvious that what you are seeing are residual effects of said blacklisting?
> Apparently the recipient domains in question have added you to their own
> internal black lists or other filter database categories (i.e. manual spam
> scoring of your domain in SA). You need to contact them--all of them--directly.
But that's just it. When the spam problem occurred, mail never went
beyond our ISP. Our ISP were the ones that blacklisted us, and they have
since removed that block.
That aside, SLES box #2 I mentioned in my earlier email also hosts
mail... but at a different location, using a different ISP. It was not
infiltrated by spam as SLES box #1 was, but outbound mail it sends is
also is being rejected by Hotmail (some cases it's let through, but when
so, it is being marked as junk).
So while the blacklisting may be a part of the problem with SLES box #1,
it has absolutely nothing to do with SLES box #2. Both, however, are
having delivery problems to the same sort of hosts. So that is why I am
scrutinizing my mail configuration.