IOS 18.1 Personal Mail Not Updating Folders

A week ago I installed the IOS 18.1 update on my 15 and I noticed my personal email was not updating. My AOL, Google, Yahoo, iCloud email accounts are behaving just fine, but my personal email is a custom address which is not on the list. All of my older devices, with older IOS versions are processing all of my emails just like they have been since 2010. I have changed the account settings and even deleted the mail box from my phone and started new. Nothing. I have a 10 year old iPad Mini, with the latest IOS it can accept, and the mail app works just fine. I have been getting by okay using the Google Mail app (which works just fine with my custom address), but I really prefer the format of the Apple Mail app.

In case you're wondering why I have so many email addresses, I've been working with computers since 1982, so I've managed to accumulate a lot for various reasons over that time.