Library /sys$common/syshlp/mailhelp.hlb SEND, Qualifiers, /EDIT  *Conan The Librarian (sorry for the slow response - running on an old VAX)

       /EDIT
       /NOEDIT

    Invokes a text editor to edit the message you are sending. Unless
    you have selected a different editor, the DECTPU-based EVE editor
    is invoked. The /NOEDIT qualifier overrides the SEND/EDIT command
    if you entered the DCL command MAIL/EDIT.