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Thunderbird just started Error message: Sending of password for user xxx did not succeed

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I have three accounts using Tbird. The other two accounts are still working fine but I can no longer send or receive email from this account. When I start Tbird I get the other email but for this account I get this message:

Error with account 1234@pacbell.net Sending of password for user 1234@pacbell.net did not succeed. Mail server inbound.att.net responded: Server error - Please try again later.

When I try sending email from this account I get:

Login to server outbound.att.net with username 1234@pacbell.net failed

Please help. Thank you

I have three accounts using Tbird. The other two accounts are still working fine but I can no longer send or receive email from this account. When I start Tbird I get the other email but for this account I get this message: Error with account 1234@pacbell.net Sending of password for user 1234@pacbell.net did not succeed. Mail server inbound.att.net responded: Server error - Please try again later. When I try sending email from this account I get: Login to server outbound.att.net with username 1234@pacbell.net failed Please help. Thank you

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Réiteach Roghnaithe

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Thanks sfhowes, Yes I'm using Secure mail keys. I double checked to see if all my accounts were using secure mail keys and all of them were. I signed into the 1234 account online and also checked there and it showed I was using a secure mail key. After posting this question, I went back to this account and set up a new secure mail key on the chance it may have gotten corrupted. I can now send and receive email from the 1234 account so I guess that was the problem. Funny how things that work for years can just choose to go bad.