Diễn đàn hỗ trợ Thunderbird

After last update, Missing "TRASH" folder and only have Junk Folder that everything is put in and marked as "Junk". Then those messages are all marked as "junk" automatically that may not be Junk. Tried to create subfolder named "Trash" and will not allow. Windows 10, 64 bit Dell laptop I-5 Inspiron 5759.

My Get Messages is grayed out, how do I fix? Not downloading messages I searched the answers for this and tried what was suggested and now the Mail Toolbar is completely gone, the suggestion was to Restore Default setting and I did and now my Toolbar is completely gone

I have many folders and sub folders and before the new upgrade each sub folder would show the number of new messages. Now only the main sub folder shows and if there are messages only the first level local sub folders show new messages not the second level and third level.

I have several emails set up on my desktop Thunderbird app (Yahoo, Gmail, Fastmail). For some reason all emails that I receive in Yahoo are also showing up in the Fastmail account. I do not have this set up at Yahoo (I have the standard account that does not allow automatic forwarding) so I believe it is happening in Thunderbird. How do I turn this off? Thanks.