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Cannot send emails through Thunderbird 102.11.0 64-bit on fedora 36

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I have five separate email accounts on xfinity: call them b, 3, 7, a, and p. All of them are set up in Thunderbird. Any attempt to send an email through Thunderbird on any of the accounts opens a window requesting the password for 7. The password for 7 is in Password Manager. If I copy and paste the password from the Password Manager or from KeyPassX I get the "Login to server smtp.comcast.net with username 7 failed" with an "Enter New Password" button in the pop-up. The password is correct and still current as verified by opening my xfinity account directly. This has been happening sporadically and randomly (correcting itself sporadically and randomly) for many months and for several updates. I have tried all the suggestions posted on this forum for other victims, but none of them have been successful for me.

I have five separate email accounts on xfinity: call them b, 3, 7, a, and p. All of them are set up in Thunderbird. Any attempt to send an email through Thunderbird on any of the accounts opens a window requesting the password for 7. The password for 7 is in Password Manager. If I copy and paste the password from the Password Manager or from KeyPassX I get the "Login to server smtp.comcast.net with username 7 failed" with an "Enter New Password" button in the pop-up. The password is correct and still current as verified by opening my xfinity account directly. This has been happening sporadically and randomly (correcting itself sporadically and randomly) for many months and for several updates. I have tried all the suggestions posted on this forum for other victims, but none of them have been successful for me.

All Replies (5)

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First, have you enabled 3rd-party access for all accounts?

https://www.xfinity.com/support/articles/third-party-email-access

Second, do you have separate smtp servers for each account?

https://support.mozilla.org/en-US/questions/1350593

https://www.xfinity.com/support/articles/email-client-programs-with-xfinity-email

Finally, it's probably OK to have KeePassX store TB passwords, as long as that app isn't actively managing the passwords in TB. i.e. it isn't entering the passwords automatically when connecting to a mail server.

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"First, have you enabled 3rd-party access for all accounts?" **Yes: they were already enabled.**

"Second, do you have separate smtp servers for each account?" **Yes. This info was new to me but I have done this using the method described in the link provided: https://support.mozilla.org/en-US/questions/1350593**

"Finally, it's probably OK to have KeePassX store TB passwords, as long as that app isn't actively managing the passwords in TB. i.e. it isn't entering the passwords automatically when connecting to a mail server." This describes my use of KeePassX: I manually cut and paste when I need a password from it.

I appreciate your help, but...my problem persists, unchanged.

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Check that the User Name in Account Settings is the full email address, not just the part before @.

If you have now configured the accounts and smtp servers correctly, remove the entries from Saved Passwords in Settings, then restart TB and enter the account passwords for each account when prompted (in case of possible leftover password mixups). Disable a VPN if you have one.

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My Account Settings panel used the phrase "Account Name." Is that what you mean by "User Name?" All are of the form *************3@comcast.net (or g, p, etc.). All outgoing servers are of the form "*************3@comcast.net - smpt3.comcast.net" I have no VPN.

The problem persists.

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The User Name is a field under Account Settings/Server Settings, and also in Outgoing Server (SMTP).

The outgoing server is smtp.comcast.net on 465, SSL/TLS, normal password. There is no smpt3.comcast.net.