ITU-T X.404-1999 Information Technology - Message Handling Systems (MHS): MHS Routing - Guide for Messaging Systems Managers Series X: Data Neworks and Open System Communications Message Handling Systems
This Recommendation I Technical Report specifies the means by which the administrator of various aspects of an MHS system may configure information into the directory for MTAs to use to determine the routing of messages. ITü-T Rec. X.412 I ISOIIEC 10021-1
ITU-T X.404-1999 history
1999ITU-T X.404-1999 Information Technology - Message Handling Systems (MHS): MHS Routing - Guide for Messaging Systems Managers Series X: Data Neworks and Open System Communications Message Handling Systems