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Using Thunderbird to send SMTP through my GMail fails, even when OAuth token established

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  • Last reply by frisée

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I have used the Thunderbird support article "Automatic Conversion of Google mail accounts to OAuth 2.0 Authentication" to make sure that I have configured Thunderbird appropriately after Google changed to using OAuth authentication. IMAP is working correctly for incoming mail, but I am not able to send messages from Thunderbird using GMail SMTP. The message send fails, stating that it times out.

https://assets-prod.sumo.prod.webservices.mozgcp.net/media/uploads/images/2025-01-28-23-13-50-d85c81.png

I am able to use my GMail account's Web interface to send a message, so I know that my account has that capability. Has anyone any experience on how to solve this problem?

I have used the Thunderbird support article "Automatic Conversion of Google mail accounts to OAuth 2.0 Authentication" to make sure that I have configured Thunderbird appropriately after Google changed to using OAuth authentication. IMAP is working correctly for incoming mail, but I am not able to send messages from Thunderbird using GMail SMTP. The message send fails, stating that it times out. https://assets-prod.sumo.prod.webservices.mozgcp.net/media/uploads/images/2025-01-28-23-13-50-d85c81.png I am able to use my GMail account's Web interface to send a message, so I know that my account has that capability. Has anyone any experience on how to solve this problem?
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“Sending failed. Message couldn’t be sent because the connection to the outgoing server SMTP timed out. Try again.”

If you search for the string "the connection to the outgoing server SMTP timed out" in the top right search field, there will be numerous articles with information about how to resolve this issue.

The most common solution is that Anti-Virus software needs to be switched off from scanning emails.

If the solutions offered don't work, please reply to the post and it will be relisted as in need of a solution.

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