Recent Thunderbird woes....
Since one of the (many...) recent updates of Thunderbird I have been having gradually worsening major issues with the handling of junk mail.
It began when mail I manually marked as junk started disappearing straight away instead of going to the collective junk folder. I changed the individual account's junk settings but this had absolutely no effect and when I revisited the account's junk settings page I discovered that my changes had been binned. Reinstating them, thinking that finger trouble had caused it, and saving the changes proved useless because revisiting the settings ten seconds later revealed that they'd been binned once more.
Repeating the exercise with all of the other accounts revealed the same problem occurring everywhere. Altering the global junk settings proved to be equally ineffective. It is now impossible to get anything to be transferred to the junk folder - it all goes straight down the bin.
The problem is made worse when finger trouble happens when reviewing the new mail received each day because a slip with the mouse means that important unread messages can be clicked straight to oblivion by a simple mistake.
I have now begun strongly to suspect that Thunderbird itself has started to tag new mail as junk inappropriately. My safely received mail has now dropped to almost zero and, if I'm quick and paying full attention, I can see the mail arrive in the account and then disappear again within one second - never to be seen again. I have reset the junk learning process several times, in the hope that Thunderbird won't recognise anything as junk, but have seen absolutely no benefit.
I cannot be the only one. Surely Mozilla must know about it. I have told them but have seen neither acknowledgment nor response. I don't want to do it but I'll have to change (any recommendations, please - not webmail?) soon.