OK I just solved the issue on my Mac maybe it will work on yours??
I moved the LIbrary/Mail folder out of its place and placed it on the desktop then rebooted then launched Mail and it works fine. Hopefully this works for others.
iconoclast
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I have the same issue - how am I supposed to turn of GMAIL if it won't even launch Mail without crashing? I disabled them in Internet Settings but same issue. Oddly, I only have this issue on my iMac Pro not on my MacPro or MacBook Pro??