Account Error warning in my Mail page (macOS high sierra -10.13.6)

[Muizen]

As goes from the attached screenshot of my Mail page, it shows at the right side a kind of warning symbol and "Account Error".
At the left side next to the Inbox symbol the same warning signal shows up.

When I click on either one symbol, a message shows: "OnLine Status" and the words "Try again".
This message shows up for a reason, and might perhaps be of some importance?

Thanks for advice!

Harry

 

[iosandstuff]

Well, on the left side of the mailboxes there is also an issue icon near google . Maybe your account settings must be checked or there are new privacy settings that you should check ? hope this helped .