Windows 10 bereikte EO (einde ondersteuning) op 14 oktober 2025. Als je Windows 10 gebruikt, lees dan dit artikel.

Windows 10 reached EOS (end of support) on October 14, 2025. If you are on Windows 10, see this article.

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unable to connect to the outgoing (SMTP) server smtp.gmail.com

Thunderbird E-mail verzenden en ontvangen
Duncan Murdoch beantwoord
Midori Takajo
Midori Takajo

Hello everyone

It's been for a few days since somehow it became unable to send mail. The error message is "The message could not be sent because we were unable to connect to the outgoing (SMTP) server smtp.gmail.com. The server may be unavailable, or the SMTP connection may have been rejected. Please verify that your outgoing (SMTP) server settings are correct and try again. Problem is I cannot see any mistake in my smtp setting. Some help much appreciated. Thank you.

Taka Jimbo

Hello everyone It's been for a few days since somehow it became unable to send mail. The error message is "The message could not be sent because we were unable to connect to the outgoing (SMTP) server smtp.gmail.com. The server may be unavailable, or the SMTP connection may have been rejected. Please verify that your outgoing (SMTP) server settings are correct and try again. Problem is I cannot see any mistake in my smtp setting. Some help much appreciated. Thank you. Taka Jimbo
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Alle antwoorden (3)

Wayne Mery
Wayne Mery
  • Top 25-medewerker
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I chatted with someone today, who regained function by deleting the account's password from Thunderbird.

Does that help?

Midori Takajo
Midori Takajo Vraageigenaar

Deleting passwords sound a bit risky, but if it works... thank you.

Duncan Murdoch
Duncan Murdoch

I have the same problem, but I'm not using a password, I'm using Oauth2 authentication. The authentication dialog never pops up.

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