IMAP ok but SMTP fails on Windows 11
Hello,
I have been using Thunderbird for many years without any issues. I recently bought a laptop running Windows 11. On this machine, I have two accounts that cannot send emails via SMTP. What is puzzling is that I can retrieve emails through IMAP without any problems.
For another account I had to use STARTTLS to get it working. But on my Windows 10 machine, the same account is sending emails correctly with SSL/TLS.
Thunderbird is allowed through the Windows firewall and is on the antivirus whitelist.
I recently fixed an issue (connecting to Gmail) by allowing cookies, so it might be a simple fix like that.
Could someone help me, please?
Many thanks!
All Replies (1)
Please verify you do not have an antivirus scanning outgoing mail.
Clearly based on your comments you are not running a default installation, or cookies would be allowed automatically. So if you are having issues, returning things to their defaults would be a good start.