Email Marketing Software

I know I have seen a directory somewhere actually a tool bar with a link to look up someones email address. I have an email address of someone but part of if is so faint I can’t read it. I need to email them but I waisting alot of time trying to find their address. Thanks for the help!
I can tell they have an aol address.

Will I need to cut and paste email addresses in a contact list?
online advertising