MSGTAG Free allows you to know whether the person who you sent your email two actually read your message and is just ignoring you, or whether he or she is on vacation, etc.
LocationMail tells you where e-mail was sent from. It uses the most accurate data in the world to analyze your e-mail, trace it, and look up where the sender was when the message was sent. Find out where your friend was when she e-mailed you, or where a business contact is really writing from.
When you use DidTheyReadIt, e-mails that you send are automatically and invisibly tracked. The instant the recipient opens your message, DidTheyReadIt automatically notifies you.