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I am with ATT in Houston. Recently my neighborhood received fiber and I upgraded.

I tested Internet, phone, and TV. Did not think to test email. Somehow email broke. Thunderbird takes like 30 seconds to time out and I get an error message server returned an error. If I use the browser (mail.yahoo.com) I get email. I even get test messages I sent to myself from Thunderbird. I have an email in mail.yahoo.com invalid device identified and blocked and ATT claims to have removed the block.

Exact message: Sending of password for user xxxyyy@att.net did not succeed. Mail server inbound.att.net responded: Server error - Please try again later.

I installed the latest upgrade to Thunderbird.

Any thoughts on how to fix this?

  • What exactly is the returned error message? – harrymc Nov 17 '18 at 15:04
  • @harrymc I updated the question. – paparazzo Nov 17 '18 at 15:09
  • Try the checks in this article. – harrymc Nov 17 '18 at 15:11
  • Which Operating System do you use? It may help to suggest debug procedures. – AnFi Nov 17 '18 at 15:41
  • @AnFi Windows 7 – paparazzo Nov 17 '18 at 18:21
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I'm not using ATT and cannot test, but according to all the user testimonies I have read, calling ATT Support does not solve the problem. Here are some suggestions for what worked for some people:

  1. Sign into your AT&T Webmail account, sometimes it helps.

  2. Increasing the send/receive to 15 minutes or try on hours of low traffic, will tell if the problem is ATT traffic congestion.

  3. Create a secure mail key (profile->sign-in info->secure mail key) and use it in place of your POP/IMAP and smtp server password. For more information see also the items marked as solution on these posts:

  4. Do this ATT Troubleshooting.

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