VMS Help MAIL Routines, MAIL$USER_DELETE_INFO, Input Item Codes  *Conan The Librarian (sorry for the slow response - running on an old VAX)

 MAIL$_USER_USERNAME

    MAIL$_USER_USERNAME specifies the record to be deleted from
    the user profile database. The buffer address field of the item
    descriptor points to a buffer that contains the user name string
    encoded in a character string 0 to 31 characters long.

    Specify a value from 0 to 31 in the buffer length field of the
    item descriptor.

    The item code MAIL$_USER_USERNAME is required.

 out_item_list

    OpenVMS usage:itmlst_3
    type:         longword
    access:       write only
    mechanism:    by reference
    Item list specifying the information you want the routine to
    return. The out_item_list argument is the address of a list of
    item descriptors, each of which describes an item of information.
    The list of item descriptors is terminated by longword value of
    0.