VMS Help TCPIP Services, SMTP, Forwarding Messages  *Conan The Librarian (sorry for the slow response - running on an old VAX)

    You can forward any mail you receive to any internet host. Follow
    the OpenVMS Mail conventions for forwarding mail.

    If you move to another system that supports SMTP, SMTP can
    forward your mail to your new location. When you set this
    features, type the new address within three sets of quotation
    marks.

    Use the following syntax:

    MAIL> SET FORWARD
    _Address:SMTP%"""new_user_name@forwarding_host"""