I have gone to apple about this as well they are playing the APPLE VS GOOGLE GAME throwing it back to google
I've put a couple of post already up on this.
Apple's IOS update 10.3.1 Broke gmail IMAP prefix. Apple vs Google being thrown to google now
Apple vs Google being thrown to google now
I recently updated to iOS 10.3.1 the other day and immediately after the update my gmail account stopped working correctly.
Just to give a heads up i am in the IT world as well so i am nota beginner to all of this stuff.
I have my gmail account setup as map the regular way you setup email on iOS devices except i use the gmail prefix feature [Gmail]
Right after the update all this went broke. Not only on my device even my wife's iOS devices. Yet our Mac's which use the IMAP prefix [Gmail] have no problem just the iOS devices.
Now we did not let her phone update, Only her iPad. We prevented her phone from updating because the prefix works on her iPhone without any problems using the 10.3.xx it was.
After speaking with Apple Support agents 2nd level support indicated she was able to reproduce the same thing with her own personal gmail account so she sent it to the engineers who came back with telling me to go to gmail now with this issue.
So out of logical conclusion it seem like this has all stem from the iOS update which is causing the prefix not to work anymore. I've tried a ton of things to get this fixed and right now back to square 1 .
Setting the gmail account up with no prefix and wishing i didn't upgrade
Also to point out imap prefix works with apple mail program on the mac but not on the iOS devices now after the update
I hope i get someone to shed some light to this.
See scree attachments of before and after to shed some further light on the situation.
THIS IS AFTER IOS UPDATE - and with the IMAP prefix used [Gmail] if you put the prefix in now it causes the mapping of folders to be all off also causing your emails if you for example delete an email it will create a [Gma][Gmail]/trash.
Like it creates an extra folder. But removing the prefix corrects all this.
The only bad thing now is visually it doesn't look pleasing and your suck with looking at the [Gmail]
So you can no longer use the IMAP prefix for gmail when your using iOS devices from what i discovered after the update to IOS 10.3.1
THIS IS WHAT IT SHOULD LOOK LIKE BEFORE THIS IOS UPDATE AND THIS IS WITH THE PREFIX BEING USED IOS BROKE THIS AND APPLE ENGINEERS INDICATE ITS NOW A GOGLE PROBLEM - Why on iOS devices does this not work anymore? google or apple?
Lets play the game toss it back between apple and google now .. Apple is having me go to google engineers lets see what is said
Already spoke with apple engineers who state its now google. But to me if its google why would and update break this. To me apple must of done something to make something that was work now not work.
Who does the repair fall to now.