rfc-2163
Using the Internet DNS to Distribute MIXER Conformant Global Address Mapping (MCGAM)
This memo is the complete technical specification to store in the Internet Domain Name System (DNS) the mapping information (MCGAM) needed by MIXER conformant e-mail gateways and other tools to map RFC822 domain names into X.400 O/R names and vice versa. [STANDARDS-TRACK]