This paper is about a system to securely match e-mail addresses with postal addresses. When a retail provider gets a request from a customer to send merchandise to an e-mail address, the retail provider contacts the matcher to request the postal address of such an e-mail. The matcher then contacts e-mail recipient to request permission to pass his/her postal address to the retail provider. Next, the matcher authenticates the e-mail recipient by means of a previously established interaction with an external customer rhythm entity that stores and verifies the e-mail recipient’s typing rhythm. If the e-mail recipient is authenticated, and gives permission to pass to retail provider his/her postal address, then the matcher sends this information to the retail provider for this to send the e-mail recipient’s merchandise to the approved postal address.

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