No server available

Mail
1

Getting a lot of these messages today.

[IMAP] Cannot open folder “/Sent”. (NO Server Unavailable. 15) (various folders)

I can log into my account on Outlook and the server is working fine so is there an issue with eM Client?

2

I’m also seeing the same errors

3

SInce 2 days , me too I get a lot of these messages , in addition the color coding of the received mails in the different folders are again and again lost.

What is wrong and what is the solution ???