I am receiving emails from a trusted source but they keep going to the spam folder. These emails are not marked as spam (e.g. with mark/unmark as spam header) but just go there. I have checked the previous recipients list and the sender in not there although I have sent emails to them. They are also in my contacts. How do I add to this list?
iMac
El Capitan
Mail 9.3
iMac
El Capitan
Mail 9.3