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2 Messages

Fri, Dec 7, 2018 6:07 PM

AT&T SMS Server Reply "try again later", Unable to Send Text Message to AT&T Wireless Users, Dec2018

AT&T SMS server is replying with error message to received email.  Without accepting the email, AT&T is not sending text message to Wireless phones. Intermittent issue, but lasting for days.

Error response: "452 4.1.0"  and "try again later" (in reply to MAIL FROM command)

Responding AT&T server:[]


Our organization depends upon AT&T to provide email access to enable sending of text messages to AT&T Wireless system users.  We have safety and security policies which assume cell phone carriers deliver email messages as text messages to the cell phones of our employees.  Each cell phone carrier has an SMS system which includes an internet domain accepting email in the format of @.  The domain for AT&T is "".  


Since November 27, 2018, for periods lasting hours and days, AT&T SMS system response to our email messages has been "try again later".  Try again later is not acceptable in security and emergency situations.  The system was unavailable afternoon of Nov 30 through morning of Dec 3, and for hours during afternoon to morning of Dec 3-4, mornings of 5, 6, and 7.   I checked one month of logs.


I understand the concept of "too busy to help", but not where SMS is concerned and when trying again after a reasonable time does no good.  None of the other carriers have the problem, and we cannot re-write third party solutions that don't have ability to "try sending the message again, later."

* Is AT&T experiencing denial of service attacks?  Please let us know, and we will adjust according to when you expect a solution.

* Is AT&T doing maintenance on servers?  Please let us know, and we will adjust according to when you expect a solution.

* Does AT&T need to replace the hamsters in their SMS server(s)?  Don't forget to lubricate the bearings on the wheel, and get it done quickly, please.


Brand User



6.9K Messages

2 years ago

Hello @palouse,


Thank you for your recent posting. We appreciate your participation within the Business Community. We will be happy to look into this for you. In order for me to research your issue, I will need to verify some information. Please send me a private message:

And include the following details:
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Thank you,

Laura G.
Social Media Manager

*I am an AT&T employee, and the postings on this site are my own and don't necessarily represent AT&T's position, strategies or opinions.



2 Messages

2 years ago

AT&T servers blacklisted our firewall vendor's IP address(es), according to contractor who installed firewall.  Issue resolved between vendor and AT&T. Our email alerts to our employees who are also AT&T Wireless customers now working as expected.  Issue resolved.