I can't send Gmail via Thunderbird.

Suddenly and inexplicably, I have a problem sending Gmail via Thunderbird.
Here is the error message I get:
"An error has occurred when sending mail. The mail server responded: 5.7.0 must issue a STARTTLS command first. d5sm23925573pdl.85 - gsmtp. Please make sure your e-mail address is correct in your mail preferences and try again. »
This error started yesterday. Nothing has changed on my computer that I know.
I use the Windows Firewall and Avast.
Thank you!
-Jim

Thanks for your reply, Christ1. I was not aware of authentication OAuth2. It's really good to know.
I found the source of my problems, and perhaps this might be addressed in a future revision of Thunderbird. I didn't see the settings for the outgoing server (SMTP) in the left column of the main account setting window. This topic should maybe a sticky at the top of the list of the menu, as I was unaware of its existence until I found an old thread in the Google Help forum.
To quote the user,
"The SMTP settings will not affect incoming mail. You are probably change the incorrect server settings. In Thunderbird, you must check the definition of the SMTP server associated with the account in the main account settings page, near the bottom. Then select the settings for the outgoing (SMTP) server at the bottom of the left column, to check and adjust the SMTP server".
Wow! Here I saw that earlier!
Matt and Christ1, thanks for your help!

-Jim

Tags: Thunderbird

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