Paired t-tests are a form of blocking, and have greater power than unpaired tests when the paired units are similar with respect to noise factors that are independent of membership in the two groups being compared.
The service, by the way, is called AOL My eAddress. AOL says it supports .com or .net domains, up to 100 e-mail identities per domain, 2 GB of storage, spam filtering, and open mail clients such as Outlook and Thunderbird through the IMAP protocol.
AOL is an online platform that features an email service called AOL Mail. One of the features of AOL Mail is its ability to automatically forward all incoming email messages to another email address. You can set this mail forwarding feature through AOL Mail's general settings menu. Once you have setup email forwarding, you will continue to receive emails in your AOL Mail inbox.