65.81.91.10 is the outbound address. .11 is inbound.
Also, these are static. Should static addresses be an exception? We aren't acting shifty like dynamic addresses.
That's exactly the problem. :) Any spam database that claims to block dynamic IPs (which is what this one is apparently doing) that lists static IPs is broken. It's no different than a spam database that claims to only include IPs belonging to hardcore spammers that happens to include an AOL IP. It's an error (incorrect listing).
"adsl-065-081-091-010.sip.cha.bellsouth.net" has the numbers in it that make it appear to be a reverse DNS entry that belongs to an ISP -- and therefore to the ignorant assumed to be a dynamic/dialup IP.
Of course, there is no logic to assigning something like "adsl-065-081-091-010.sip.cha.bellsouth.net" to a dynamic IP and a completely different format (perhaps "adsl-12345.sip.cha.bellsouth.net") to static IPs. So the numbering scheme shouldn't be able to identify dynamic IPs (it's much better at identifying non-vanity reverse DNS entries). And I'm guessing that ".sip." indicates "static IP", so it sounds like your ISP has done their job correctly.
So the short version is that whoever you are trying to send E-mail to is using poor anti-spam software (that is blocking E-mail on a single criterion) that is using a poor anti-spam database (one that lists IPs erroneously, like MAPS-DUL). Combine the two, and well, you get the billion false positives a year. :)
-Scott
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