error sending message agter upgrading to 78.12.0
I've been using thunderbird for years.
I use windows 10. I have an IMAP e-mail account on zimbra server.
After latest update sending a message fails as well as writing it as a draft.
Incoming e-mails work fine, as usual.
I changed TLS (security.tls.version.min) support to 1 - didn't help. Turned off firewall and antivirus- same thing. Adding another SMTP setting doesn't help either.