email2 allows senders to truly recall message that were sent in error.
When a message is recalled, recipients will no longer be able to access the message or its attachments. The only thing that recipients will see is the message subject line, and a notice that the message has been recalled by the sender.
Unless a recipient has already read the message, he or she never will. Even if the message had been accessed before, the next time a recipient tries to view it, it will be unavailable.
Only senders may recall a message, and once recalled, a message cannot be recovered. When recalling a message, senders are optionally able to give an explanation, which will be displayed to any recipients that try to access the message.
// Edited July 2008