1. A method for communicating e-mail messages using a secure e-mail service, comprising: receiving an e-mail message from a sender addressed to a recipient; receiving a request for access to the e-mail message from an e-mail client associated with the recipient; providing the e-mail client with access to the e-mail message; receiving a navigation notification indicating a navigation away from the e-mail message followed by a navigation return to the e-mail message; and in response to receiving the navigation notification: withholding access to the e-mail message by the e-mail client, and providing the e-mail client with a message placeholder.