Diễn đàn hỗ trợ Thunderbird

I noticed yesterday with version 115.4.2 32-bit (I just updated now) that an e-mail, part of a correspondence, would not load. Actually it did load but it seems to have permanently replaced the original message with a completely different e-mail from a different sender. But the From and the Subject lines pertained to the e-mail that was supposed to be there. The replacement message, if it matters, is an e-transfer notification, again, from a completely different sender.

I noticed then that a few other e-mails show only code data in the body. This is loading from a Gmail account which appears to be intact when I log in there directly.

I was also concerned when I first went to open Thunderbird from the taskbar, that a Win 10 pop-up appeared as I hovered over to click the icon, showing "recent" e-mails from all different dates, most of them well in the past and certainly not accessed recently. This has me concerned about a security breach.

PS: When I tried to remove the "recent" e-mails pop-up menu I accidentally deleted the taskbar shortcut and now can't get it back. Well, I can but the TBird icon won't reload and it just shows up as a blank icon.

Some mails always end in spam folder no matter which settings I have tried for example collected adresses or check/uncheck spam settings. For a test I have two hotmail accounts. When I from thunderbird send mail from one to the other, it ends in spamfolder. But if I from the same mail account from outlook.live website send mail to the same account, it doesn't end in Thunderbird spam folder. Besides this many other safe and regocnized mailaccounts recently starts to end in spamfolder. Can any thing be done?