Greetings Brain Trust,
We have found ATT to be heavy handed with their email (spam) filtering. Without warn all of our mail servers will be denied from delivering email to their many domains (att.net, bellsouth.net, etc). They have a removal request form (like most other large ISPs) which takes 2 days to process. We never find out why the we get listed. We always check as many "email" reputation systems and rbl searches to determine why. Everywhere we
look we see no evidence of a problem. We have joined other ISP feedback look system, (AOL, Yahoo and even Hotmail/Live) which all have helped stop issues (comprised accounts, bots, etc) before they get to the point of a listing/block.
I have searched and I can not find out definitively whether ATT has or does not has a feedback loop system. Anyone out there know?
I know of no ATT FBL system.
If you are getting ATT rejects, then you can enter some info here:
http://worldnet.att.net/general-info/block_admin.html
However, if you are getting blackhole'd you have no recourse, IMHO.
If any AT&T rep wants to step forward, I've know a few people waiting
in the wings with very similar issues. One even suggested the
blackhole'ing is related to American Idol, as you need to keep your
pipes clean for those revenue generating SMS texts. 
-Jim P.
I figure I should follow up with a sample error message from our logs:
<xxxxxxxx@bellsouth.net>: host gateway-f2.isp.att.net[207.115.11.16] refused to
talk to me: 550-208.98.210.35 blocked by ldap:ou=rblmx,dc=att,dc=net 550
Error - Blocked for abuse. See http://att.net/blocks
Wade Peacock
Wade Peacock <wade.peacock@sunwave.net> writes:
We have found ATT to be heavy handed with their email (spam) filtering.
Without warn all of our mail servers will be denied from delivering email
to their many domains (att.net, bellsouth.net, etc). They have a removal
request form (like most other large ISPs) which takes 2 days to process. We
never find out why the we get listed.
We have dealt with issue in the past. AT&T maintains an internal
blacklist and their blacklist policies are not published. There is
also no feedback loop mechanism in place, AFAICT. I do know that
sending backscatter to AT&T will get you in their blacklist. If your
server sends NDRs instead for rejecting during the SMTP transaction
for 5xx type messages then that is probably what got you on their list.
The email address we have used at AT&T to resolve these issues is:
<abuse_rbl@abuse-att.net>. Make sure that all of issues which caused
your blacklisting are resolved because if they put you on the list again,
it is much tougher to get removed.
I have searched and I can not find out definitively whether ATT has or
does not has a feedback loop system. Anyone out there know?
It would be wonderful if they had a feedback loop.
We've done research recently and found no evidence that they have one.
At least they do have the IP removal tool... not that it does much.
I'm afraid it just makes it so you get the privilege of using their
IP removal tool again sometime soon.
Or you could not send any emails to them, and your delivery would be 100%..
or would that be null..