Mail Issue

[Rubydoppler]

So here is the screen, I can't delete nor open this message, it's just sitting there. Ideas?

 

[Andru1313]

I would delete that mailbox then re add it...

 

[nobblynoel]

This has been talked about before..
https://forums.macrumors.com/threads/960234/

 

[b-rad g]

I just had this problem today, as well as (4) unread emails showing up but they were nowhere to be found.

This is what I did and it solved the problem. I went into multitasking and force quit the mail app. I then went back to mail app and all folders and messages back to normal.