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ATT Blacklist

Posted on 2014-11-20
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Last Modified: 2015-05-04
emails going to att.net and Comcast from our exchange server is being blacklisted by att. How do we resolve?
We are not on any "blacklists"

Thanks
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Question by:interc3905
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6 Comments
 
LVL 37

Expert Comment

by:Neil Russell
ID: 40455932
You cant say that emails are being blacklisted by ATT and then say that you are not on any blacklists.
Please explain exactly WHAT you are getting that makes you say your emails are being "Blacklisted by ATT" and what you have have done to ensure that you are NOT on any blacklists.
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LVL 5

Expert Comment

by:Bob Bender
ID: 40456080
In most companies there are filtering tools on email systems that do not allow certain conditions.  For example, anyone sending or receiving passes along a script file (or an exe file) will have their email deleted.  Other reasons would be "no attachments, attachments too large, jokes, chain letters, or many other reasons.

Your use of the word "blacklisted" is odd.  Do you think there are lists shared by companies of "threats" and would be used used to enforce a "black-list"?  An example of that would be the No-Call phone list that has fallen apart and useless) All in all, I have to chuckle at that theory.

I would venture to say (baased on experience with network traffic patterns) that AT&T (and maybe Comcast) rules concerning incoming emails are NOT meeting their stringent rules to protect their servers from threats.  

As such, they either reject them, or simply throw them away.

Bob
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LVL 37

Expert Comment

by:Neil Russell
ID: 40456173
"Your use of the word "blacklisted" is odd.  Do you think there are lists shared by companies of "threats" and would be used used to enforce a "black-list"?  An example of that would be the No-Call phone list that has fallen apart and useless) All in all, I have to chuckle at that theory."

The use of the word "Blacklisted" in terms of email is perfectly correct and yes, blacklists do exist and are used extensively, thank god, in keeping the internet volume of spam and viruses down lower than it would be without blacklists!

See  http://mxtoolbox.com/blacklists.aspx
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LVL 5

Expert Comment

by:Bob Bender
ID: 40457892
Neilsr....   Thank you for the courteous reply and clarifying things.  My "verbiage" in the past work experiences in working with mail servers was a number of years ago.  Practices and terminology has changes.  Just saying that we used "rules" to control the emails our company received.  Maybe my duties involved controlling email flow AFTER the blacklist check.  

Better to live and learn constructively...
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Accepted Solution

by:
interc3905 earned 0 total points
ID: 40467504
We sent a request directly to ATT to have our Exchange Server (IP) unblocked and they corrected the issue
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Author Closing Comment

by:interc3905
ID: 40757799
This worked
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