Mail on mac stuck 'moving messages'

In mid August 2020, my Apple Mail program got stuck moving messages from the Inbox to Trash, especially multiple messages. Then I noticed deleting the Trash constantly causes a Crash, deleting more than 2 messages at a time. Apple apparently, and refuses to acknowledge they made a Server Change. As the only Mail program and exchange I have is with Apple. I noted that Apple has moved past any support whatsoever for El Capitan. All they care about is new products and technology, it doesn't matter if they work, for Apple, now it's all about glitz and glitter, nothing else.

Thank you. I am going through "Baby Steps" with this process, as described in the article. I did change a few items in Mail Preferences, ie: DRAFTS, as suggested. I have noticed a slight improvement, the one issue that still exists is deleting multiple messages from the Trash, seems any more than 3 emails at a time causes a crash. Seems to me this is more of a server issue, than my actual computer. I have a concern about the complete process, as many of my messages date back to 2008, and yes there is a reason I need to retain them. I would not like to even think about losing anything.

From what I can tell after playing around some more, this only occurs with Exchange servers. However, if the amount of emails is large enough, the "stuck moving messages" problem will occur on any Exchange account. I've tried three different ones and it happened on every single one. However, the problem does not occur for me on IMAP accounts. Hence, the workaround to this problem seems to be to use IMAP instead of Exchange. It seems that someone the Mac Mail app is not handling Exchange perfectly well.

I found a solution to this issue on macOS 10.15 Catalina. To fix the issue, the Apple Mail's database must be rebuilt. Once I completed the referenced steps, Apple Mail no longer had issues moving emails to folders.

https://c-command.com/spamsieve/help/how-can-i-rebuild-apple

Mine is working now. I have Gmail, not Exchange. The usual steps of synchronizing and rebuilding may have helped, but I believe the critical steps for me were to disable the rules that I had. Some of the rules were set to move emails to different directories. I don't know what that was a problem, but disabling my rules in Mail.app seemed to allow things to be unstuck.

Guys... Apple clearly don’t care about it. My suggestion is to sell your Apple thing, buy a cheap PC, install Linux or use Microsoft Outlook. Sad!

Try copying all of your trash emails to a separate file and then delete them in your mail app. That might help.

This is what helped me:

https://c-command.com/spamsieve/help/how-can-i-rebuild-apple

Thanks, unfortunately I watch my iPhone deleting all the trash and simultaneously the Mail program on my MacBook crashes. I wish it was that easy, and rebuilding hasn't accomplished anything either.