To send to this user from the Internet through CompuServe's MHS gateway, write the address like this:
pt-support@performa.mhs.compuserve.com
Other vendors of LAN gateways use other addressing methods.
X.400 addressing ———————— X.400 is a standard for electronic mail developed by CCITT. It is used on large networks like AT&T Mail, MCI Mail, Sprintnet, GE Information System, Dialcom, and Western Union, and on other public and private networks throughout the world. EDI (Electronic Data Interchange) uses X.400 as a transport mechanism for coordination of electronic part ordering, stock control and payment. X.400 is used to connect EDI systems between companies and suppliers. The X.400 addressing syntax is very different from domain addressing. To send a message from an X.400 mailbox to my address (opresno@extern.uio.no), you may have to write it like this:
(C:NO,ADMD:uninett,PRMD:uninett,O:uio,OU:extern,S:opresno)
Alas, it's not so standard as the domain addressing schemes. On other X.400 networks, the address must be written in one of the following formats - or in yet other ways:
(C:US,A:Telemail,P:Internet,"RFC-822":<opresno(a)extern.uio.no>)
("RFC-822": <opresno(a)extern.uio.no>, SITE:INTERNET)
'(C:USA,A:TELEMAIL,P:INTERNET,"RFC-822":<opresno<a>extern.uio.no>) DEL'
(site: INTERNET,ID: <opresno<a>extern.uio.no>)