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Thunderbird "Unable to log in at server" for AT&T/Yahoo

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petergrfx
petergrfx
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Thunderbird stopped working on my old Mac Mini (2014). I bought another used Mac Mini (2018), running on Sequoia 15.3, and hoped to install Thunderbird on it, but so far I can't. When I try to set it up, it says my account is recognized, but when I click done, I get the message "Unable to log in at server. Probably wrong configuration, username or password." I suspect it's the configuration. I tried my old Mozilla password, when that didn't work, I created a new one, but that didn't work for Thunderbird either.

My email comes from my ISP — AT&T — whose email service is powered by Yahoo. When Thunderbird stopped working on my old computer. I started using MyYahoo email (same email address), but I'd prefer going back to Thunderbird, which is much better for archiving and directing incoming email to folders I create.

Please help.

Thunderbird stopped working on my old Mac Mini (2014). I bought another used Mac Mini (2018), running on Sequoia 15.3, and hoped to install Thunderbird on it, but so far I can't. When I try to set it up, it says my account is recognized, but when I click done, I get the message "Unable to log in at server. Probably wrong configuration, username or password." I suspect it's the configuration. I tried my old Mozilla password, when that didn't work, I created a new one, but that didn't work for Thunderbird either. My email comes from my ISP — AT&T — whose email service is powered by Yahoo. When Thunderbird stopped working on my old computer. I started using MyYahoo email (same email address), but I'd prefer going back to Thunderbird, which is much better for archiving and directing incoming email to folders I create. Please help.

Ändrad av Wayne Mery

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Rick
Rick
  • Top 10 Contributor
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You have to get a different password from AT&T. It is called a security key or security password, I think. You can learn more by searching this forum. Sorry that I cannot help more right now.

sfhowes
sfhowes
  • Top 25 Contributor
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This page has the settings and a link to creating secure keys:

https://www.att.com/support/article/dsl-high-speed/KM1010523/

Rick
Rick
  • Top 10 Contributor
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Thanks for adding that, sfhowes.