How to unblock someone from AOL mail?

AOL mail is a free web-based email and chat-service platform. This web application is used worldwide with more than 50 million subscribers and it is available in more than 54 languages. It offers the users to send attachments like photos and videos up to 25 MB in space and provides ‘Spam protection’ and ‘virus protection’. Also, it has inbuilt spell checking for the users so they don’t do any mistakes while writing an email to the friends and family.