Whew, Thanks, I guess. MAIL was totally worse today wouldn’t open at all on MAC, on iPhone it is completely normal.
I found your answer on iPhone mail... and that was Really scary to Sign Out of iCloud and
have it tell me everything in it would be erased from my MAC (I have over 20,000 pics)
But I sucked it up and did it.
FYI: on Sign In it froze completely. I had to FORCE QUIT System Preferences to stop it.
Then Restarted (which it did WHOOT, (since I put 10.11 on Restart did not work It just froze and shutdown.)
This one worked.
Opened MAIL and it ‘thought’ a bit and BOOM 30 in inbox! ...
TY but that is scary.