The delivery of new email is accomplished using POST's notification service. A sender first constructs a notification message containing basic header information, such as the names of the sender and recipients, the subject, a timestamp, and a reference to the body and attachments of the message. The sender then requests the POST service to deliver this notification to each of the recipients.
It is noteworthy that ePOST extends recipient control beyond current systems by allowing the recipient to append the message to his mailbox or to simply ignore the notification, perhaps based on a spam filter. Since messages are stored in the sender organization's ring, one of the major goals of anti-spam researchers, to push most of the costs of spam back onto the spammers, can be achieved in a straightforward manner.