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Adding a new email

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I had my email on thunderbird for years. Changed computers and one would not work. It said the password was wrong. So I deleted it and tried to reinstall it but it still says the password is wrong. When I log into Yahoo I use the same password and it works. With Thunderbird I get a message that states : Unable to log into server. Probably wrong configuration, user name or password. I have put other Yahoo email configurations in and they seem to work, all on the @att.net platform. Anybody got a helpful idea. Charlie Parsons bmwrats@att.net

I had my email on thunderbird for years. Changed computers and one would not work. It said the password was wrong. So I deleted it and tried to reinstall it but it still says the password is wrong. When I log into Yahoo I use the same password and it works. With Thunderbird I get a message that states : Unable to log into server. Probably wrong configuration, user name or password. I have put other Yahoo email configurations in and they seem to work, all on the @att.net platform. Anybody got a helpful idea. Charlie Parsons bmwrats@att.net

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What are your server settings, and are you using a secure mail key in place of the password?

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