"This Mac can't connect to iCloud because of a problem with email" at start up

Hi guys,

Whenever my Mac starts up, this error message (below) appears. I have tried clearing iCloud cache, logging out and in, tested with vanilla installation, the problem still persists
View attachment 206640

The error does not affect iCloud functionalities though, all my safari tabs, calendar, notes etc still syncs.

My build:
View attachment 206641
Clover v2.3k r3543
El Capitan 10.11.5
Gigabyte GA-H97-D3H LGA 1150
Intel Core i7-4790
Gigabyte GeForce GTX 760
Corsair...

"This Mac can't connect to iCloud because of a problem with email" at start up