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Thunderbird will not connect to email server

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Thunderbird will not connect to my email server as of 11/07/20. Message:" Sending of password for _____________( my email address) did not succeed. Mail server pop.ATT.yahoo.com responded: Server error. – Please try again later." I have tried the fixes that were suggested on the Internet with no success. I am hoping that someone has a solution to this problem.

Thunderbird will not connect to my email server as of 11/07/20. Message:" Sending of password for _____________( my email address) did not succeed. Mail server pop.ATT.yahoo.com responded: Server error. – Please try again later." I have tried the fixes that were suggested on the Internet with no success. I am hoping that someone has a solution to this problem.

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The correct POP server for AT&T is inbound.att.net on port 995, SSL/TLS, and a secure mail key must be entered in place of the account password.

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

See https://support.mozilla.org/en-US/questions/1313640