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I'm still being blocked by AT&T's domains

Hello again,
I thought the previous issue was resolved but my clients emails still seem to be blocked by AT&T. AT&T is of absolutely no help. I've sent in requests to be removed from the blacklist, I have a reverse DNS (PTR record setup already). My clients are fed up. They think I'm not doing something on the server end. Is there anything anyone could shed some light on for me? Thank you in advance.
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Press2Esc

8/22/2022 - Mon
ASKER CERTIFIED SOLUTION
Philip Elder

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50centos

Sometimes it is your fault, without knowing it. I'm not saying that it is, because I really don't know your domain and your setup.
I have a subscription to www.dnsstuff.com and able to check if domain names are blacklisted. I suggest you start from there, and start tightening your messaging system right away.
ASKER
Diagnostics

Thank you both.
I've checked my IP and DNS on DNSstuff and it just came up with some timing out errors. They say I passed.
Good point 50centos. I can totally be running errors but, I've setup SBS 2003 for some other clients and havent gone through this before. I'm just not sure where to look internally. We have a Static IP with mail.salesresultsinc.com as our MX. We're running Brighter Mail (SPAM) and Symantec EndPoint.
I havent heard of Exchange Defender, I'll look into it and see if thats the fix we're looking for.
Philip Elder

Your IP is clean.

It is an AT&T related issue probably specific to the way they have their e-mail servers set up. We have run into this once in a while.

See the screenshot report from MXToolBox.com. Your IP comes up okay.

Philip
09-01-27-MXToolbox-results.PNG
I started with Experts Exchange in 2004 and it's been a mainstay of my professional computing life since. It helped me launch a career as a programmer / Oracle data analyst
William Peck
Press2Esc

Did a look-up on 69.130.20.106, this is not an AT&T IP...  It belongs to TDS TELECOM  in Madison, WI.  As far as the 69.x.x.x address goes, your PTR/rDNS record looks fine - if you were on their network.  

Also, since you mention SBS2003 & AT&T, I suspect this server's gateway is on an AT&T network - correct?  
- If so, the email packets leaving your email server will show an origination IP of AT&T - not TDS.   Keeping in mind that many ISP will block mail that appears to be being "relayed"...  

Probably unrelated, but your (salesresultsinc.com) domain registration points to 208.42.75.180 - prob your hosting company

Can you post a failed mail header a/o an NDR?

ASKER
Diagnostics

Hello Press,
TDS Telecom is correct. The problem is that we cannot send emails to an address with an AT&T domain (i.e. sbcglobal.com, att.net, ameritech.net, etc...)
Press2Esc

Sorry, for some reason I thought you were on an AT&T Network....

In any case, can I assume that TDS is you DSL ISP?  
Do you have a public static (vs dynamic) IP assigned to the mail server a/o DSL account?
Are you able to post a failed mail header a/o NDR?
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