Library /sys$common/syshlp/tcpip$ucp_help.hlb SET, CONFIGURATION, SMTP, Qualifiers, /SUBSTITUTE_DOMAIN  *Conan The Librarian (sorry for the slow response - running on an old VAX)

       /SUBSTITUTE_DOMAIN=([NO]NAME=fully_qualified_domain
       |[NO]HIDDEN)

    Optional.

    o  /SUBSTITUTE_DOMAIN=NOHIDDEN

       In the From: and Return-Path fields, displays the sender's
       name and fully qualified domain.

    o  /SUBSTITUTE_DOMAIN=HIDDEN

       In the From and Return-Path fields, substitutes the value
       given in name for the host name. The following example shows
       how this qualifier can be used.

       For this example, the sender's host is configured with
       /SUBSTITUTE_DOMAIN=HIDDEN,NAME=eagle. User magpie on host
       condor.hawk.eagle.org sends mail to daw on another host. When
       it arrives, it appears to be from magpie@eagle, rather than
       magpie@condor.hawk.eagle.org.

       This is what daw sees:

           #707        18-NOV-2000 14:02:02.71                  MAIL
       From:   SMTP%"magpie@eagle"
       To:     SMTP%"daw@crow.ravin.rook.org"
       CC:
       Subj:   Big sale today!