PX Pointer to X.400 or RFC 822 information (PX) record. Implements mapping rules outlined in RFC 1327, which describes the ...

PX
Pointer to X.400 or RFC 822 information (PX) record. Implements mapping rules outlined in RFC 1327, which describes the standards for interoperability between systems running CCITT X.400 Message Handling Systems or ISO IEC 10021 Message Oriented Text Interchange Systems (MOTIS) with any systems that use RFC 822-based mail protocol systems. RFC 1327 mapping rules have a specific format and syntax that require an appropriate data structure and processing. The PX resource record type meets these requirements. (RFC 1664)