Library /sys$common/syshlp/tcpip$ucp_help.hlb START, MAIL, Restrictions  *Conan The Librarian (sorry for the slow response - running on an old VAX)

    Requires SYSPRV or BYPASS privilege.

    SMTP consists of the sender and the receiver. Start the sender
    before you enable the receiver.

    Do not issue this command unless SMTP has been configured (with
    the SET CONFIGURATION SMTP command).