It did not work for me either. So I went a different route—. See below.
Here is what I had to do- First, I deleted the Mail App. I restarted my iPad. I turned on each of my e- mail accounts and waited for them to load. I noticed that a number of e-mails loaded with No Subject, but if I opened them the contents were there. Some loaded with No Subject, and No Sender. Again, if I opened them, the content was there. This was pretty frustrating AND the Mail App was still loading extremely slow just like before. This was worse than before, so I “bit the bullet” and decided to completely wipe the iPad. I keep my iPad backed up every day, so I knew I could do a complete backup after erasing everything.
So far so good. I got my e-mails back with correct subjects and senders. The Mail App seems to be loading normally as well.
This has been normal for a full day so far. But alas, I did lose all my Wordle stats, but I keep a record in my Notes App, so I am okay with this small inconvenience…..
My mail seems to be loading normally so far…… 3 days and counting.
Hope this helps others.