1. A computer-implemented method for transmitting an email message from a sender addressed to both a first recipient and a second recipient, the first recipient capable of receiving email messages having a first email address compliant with American Standard Code for Information Interchange (ASCII) and the second recipient capable of receiving email messages having a second email address compliant with a non-ASCII email address, the email message having a message body, the method comprising the steps of: identifying the second recipient by the second email address and sending the message body to the non-ASCII email address as a first transmitted email message, the first transmitted email message also including the first email address in an ASCII email address format; creating a corresponding mapped ASCII email address for the second email address currently in a non-ASCII email address format by: generating a username as a mapping of the non-ASCII email address format using a predefined mapping algorithm; selecting a domain name from one or more predefined domain names, each of the domain names configured to resolve to a predefined gateway server; and concatenating the username and the domain name to create the mapped ASCII email address for the second email address; replacing the second email address in a non-ASCII email address format with the corresponding mapped ASCII email address; and transmitting the message body as a second transmitted email message to the first recipient using the mapped ASCII email address representing the second email address.