Mail app is not opening at all

Hello
A couple of days ago I restarted my computer. When I tried to open the Mail app, it just bounced once and then stopped. Tried it a few more times and it mostly bounced once then stop but once in a while it will bounce multiple times then stop. I couldn't restart right away so later that day I tried restarting and nothing. The problem still existed.
I finally get some time to work on the problem between yesterday and today. I've tried deleting the com.apple.mail.plist (actually this was missing when I first went looking for it), deleted ~/Library/Mail and ~/Library/DownloadedMail (or whatever). Mail still wouldn't open.
Then I opened up a terminal and found any reference to "Mail" in my home directory and selectively deleted those as well (not in any stupid, blind way). The problem still persisted.
I decide, ok fine let's fire up time machine. Maybe /Applications/Mail.app got corrupt? Whatever, so I deleted it and restored the Mail app from 3 weeks ago (March 1st - when I knew it was still working) yet Mail still does not open.
I've completely run out of ideas on what to do next and any input would be greatly appreciated. Is there a way to enable a verbose log so I could figure out why Mail is crashing?
Thanks!

Hi. I had the same problem today. I downloaded and installed the newest Onyx app, ran it's automation with the mail settings checked, restarted andd all is good. I think it was an issue with the mail envelope index but i'm not sure.
Hope it works for you as well.
Thomas

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