I guess that in case of declaration problem, Thunderbird wouldn't be able to send messages at all. However, sometimes (rarely), after start, it works properly and sends e-mails. Unfortunately, being left for a while in background, it restarts to have the described earlier send isssue.
I guess that in case of declaration problem, Thunderbird wouldn't be able to send messages at all. However, sometimes (rarely), after start, it works properly and sends e-mails. Unfortunately, being left for a while in background, it restarts to have the described earlier send isssue.