X.400 Addresses
The X.400 telecommunications standard is finding some
acceptance in Europe and by the U.S. government.
Addresses under X.400 always begin with a leading
slash, which can cause sendmail
to think that the address is the name of a file when
the local
delivery agent is selected:
/PN=MS.USER/O=CORP/PRMD=CORP/ADMD=TELE/C=US/
To prevent this misunderstanding, all such addresses should be followed by an @domain part to route the message to an appropriate X.400 gateway:
/PN=MS.USER/O=CORP/PRMD=CORP/ADMD=TELE/C=US/@X.400.gateway.here
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