>We host our IMAIL server at an ISP. They tell me that for better routing
>purposes, they want outgoing e-mail from us (we send a weekly html
>newsletter to about 150K folks, a gig of mail in as short a time as
>possible) to be "from" smtp.igve.theirdomain.com. So far, so good, made the
>changes to imail. Sent tests to aol and myself, and all works fine. But,
>I'm worried about spam filters -- see the following.
>
>smtp.igve.theirdomain.com isn't my mail server, it's a different IP. My
>box's IP is yyy.yyy.yyy.yyy. smtp.igve.theirdomain.com resolves to
>xxx.xxx.xxx.xxx
>
>e-mail headers have the form:
>
>Received: from smtp.igve.theirdomain.com [yyy.yyy.yyy.yyy] by mydomain.com
>with ESMTP
> (SMTPD32-6.06) id A265D73004A; Wed, 25 Jul 2001 15:56:05 -0500
>Received: from mybox.mydomain.com [yyy.yyy.yyy.yyy] by
>smtp.igve.theirdomain.com with ...
>
>Don't some / many spam filters (or just plain servers) kick out e-mail if
>the reverse dns doesn't resolve to the sending ip? Or am I all wet (again?)
the attempt to match is,sometimes, the A record hostname match the ip
address�s PTR hostname. Where the ip is the ip of the sending mail server.
But this kind of restriction is rarely applied. simply too many false
positives.
Give me the domain your list mails from and I�ll analyze it.
I�m curious, how many hours does it take you to send 150K?, or what is your
average msgs/hour?
Len
http://MenAndMice.com/DNS-training
http://BIND8NT.MEIway.com : ISC BIND 8.2.4 for NT4 & W2K
http://IMGate.MEIway.com : Build free, hi-perf, anti-abuse mail gateways
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