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I can't log into my email. It says my password is incorrect

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When I enter the password that worked yesterday, it now says: Sending of username did not succeed. Mail server mail.comcast.net responded: [AUTH] Authentication failed. Then it asks me to enter my password again. Please help. Thanks.

When I enter the password that worked yesterday, it now says: Sending of username did not succeed. Mail server mail.comcast.net responded: [AUTH] Authentication failed. Then it asks me to enter my password again. Please help. Thanks.

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In Thunderbird go to the Help Menu. Select Troubleshooting Information Click Copy to Clipboard. Come back here and paste that info into a reply window. Paste shortcut - control+v All the info about printers and fonts is not needed.