Q: iOS 10 Problems with Mail App

I am also having trouble with the Mail App.  On my iphone, ipad and Mac Pro.  I have several addresses, one MSN, another on Go Daddy and Gmail.  I am having various weird problems with threads and everyday it re-loads my emails, as though I have never read them before.  Something is definitely problematic with Mail.

APPLE folks, can you help ?

I'm also having the same type of problem with my new Iphone7 and ios10 and had similar problem with another ios updated a year ago. Apple fixed it after a couple of weeks, but only weird mail during that time was frustrating.

Hi Emily, I was having the same problem with my mail, I have multiple accounts on mine. I read an article that the new iOS 10 is having difficulties processing email addresses with apostrophes and once you delete the account with the apostrophe you can open emails in the other accounts! One of my accounts had an apostrophe and once I deleted it, I could read emails in my other accounts! I know this isn't the most ideal solution but we will have to wait until Apple patches this with an update. Hope this helps!

http://www.techradar.com/how-to/phone-and-communications/mobile-phones/ios-10-pr oblems-here-s-how-to-fix-the-most-common…