Request for Comment (RFC) is a standard used via the Internet and was created by the Internet Engineering Task Force (IETF). The RFC 5322 is an Internet Message Format (IMF) ensuring that a valid email address is in the required fields of the message; the From, Sender, Resent From and Resent Sender. A valid email address format includes a name, a symbol and a domain name such as the Help Desk email: help@somos.com. All email messages that are sent from the TFNRegistry™ are compliant with RFC 5322.