First, I recommend you reading about "Read Receipts" explained in this Wikipedia page .
Some e-mail applications, such as Microsoft Office Outlook, employ a read-receipt tracking mechanism. The sender selects the receipt request option prior to sending the message, and then upon sending, each recipient has the option of notifying the sender that the message was received and/or read by the recipient.
However, requesting a receipt does not guarantee that you will get one, for several reasons. Very few e-mail applications or services support read receipts, and users can generally disable the functionality if they so wish. Those that do support it aren't necessarily compatible with or capable of recognizing requests from a different e-mail service or application. Generally read receipts are only useful within an organization where all employees/members are using the same email service and application.
Depending on the recipient's mail client and settings, they may be forced to click a notification button before they can move on with their work. Even though it is an opt-in process, a recipient may consider it inconvenient, discourteous, or invasive.
Read receipts are sent back to your Inbox as e-mail messages. Additional technical information, such as who it is from, the e-mail software they use, and the IP addresses of the sender and their e-mail server is available inside the Internet headers of the read receipt.
The technical term for these is MDN
- Message Disposition Notifications, and they are requested by inserting one or more of the following lines into the email headers: X-Confirm-Reading-To: Disposition-Notification-To: or Return-Receipt-To:
So, if both the sender and the recipient use Microsoft Outlook with Exchange Server. they can easily request read receipts and get notified when their email is opened by the recipient.
Nevertheless, there is SpyPig.com .
SpyPig is a simple email tracking system that sends you a notification by email when the recipient opens your message.
It works with virtually all modern email programs: Outlook, Eudora, Yahoo Email, Gmail, Hotmail, AOL Email and many others. Both you and the recipient must use an HTML email, not plain-text or rich-text email.
SpyPig is FREE! No spam, no virus, no adware, no spyware. You can use it as often as you like, and there's no catch.
A paid alternative to SpyPig is DidTheyReadIt.com .
When you use didtheyreadit, every e-mail that you send is invisibly tracked without alerting the recipient.
But when they read your message, you will immediately receive the following information:
- When. exactly, your email was opened.
- How long your email remained opened.
- Where. geographically, your email was viewed.
The basic version of DidTheyReadIt is free, but is limited to 10 messages. If you want to continue using DidTheyReadIt.com after this, you can buy a subscription.