I am not able to send emails, I am receiving messages but can't send

What OS are using? What version of Thunderbird are you using?

Did this occur immediately after an update or just started being a problem some time after an update?

When you attempt to send what happens ? Do you get an error message? If yes, what does it say ...word for word verbatim or upload an image file of error message

What server are you talking about? Upload an image of your current SMTP outgoing server settings?

Do you have an Anti-Virus scanning outgoing emails ? If yes, then it might be interupting the process and server times out/connection drops. Access AV and stop scanning outgoing mail. What Anti-Virus are you using?

I can't send emails either, started on June 4th. I did have an update Version 140.11.1esr | Released May 26, 2026

I hit send and the little window just sits there "processing" and I get no messages as to what the problem is, timed out, etc..

All of the mail server information is current, as per my ISP.

I can send from the ISP's webmail.

I have Windows Defender on a Windows 11 system, but no specific AntiVirus program.