To find out how to block emails on AOL, you are supposed to follow and apply few important instructions. Now, to do it, you must follow and apply few important instructions. First of all, you must go the AOL Mobile app, and then you are required to tap an email from a sender that you wish to block. Now, you are supposed to tap the three-dot menu which is located and then you must ‘mark as spam’ and then you should repeat the process.