Customers often ask how they can know if a message has been read by a specific recipient.  Typically, this is done by requesting a “Read Receipt” when sending the message; however, read receipts are not reliable.  Spammers use techniques such as HTML “web bug” tracking to see if you have read an email message and thus if your email address is valid and ripe for more spamming; this is also not reliable. LuxSci’s SecureLine Escrow service includes a 100% reliable Read Receipt function that can be used when it is essential to know if someone has read a message. It also allows for message retraction (removing further access to an email message).

This article goes over these various methods of determining if a message has been read, shows how each works, and discusses the pros and cons of each.

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Web Bugs are images in HTML-formatted email messages that, when viewed, tell the sender of the message that you read the message.  This mechanism of obtaining an essentially covert confirmation that (a) your email address is valid, (b) the email got past your filters, and (c) you actually read the message, is pervasively used by Spammers to identify what addresses are reading their messages.

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