మీరు ఇతరులకు పంపిన emailని, వారు ఎప్ఫుడు చదివారో తెలుసుకోవాలని ఉందా?

Spypig is a free email tracking system that lets you know when the email you sent has been read by recipient. It works with virtually all modern email programs: Outlook, Eudora, Yahoo Email, Gmail, Hotmail, aol email and many others. Cool tool and it's free!

see the link:

http://www.spypig.com/