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

 MAIL$_SEND_CC_LINE

    MAIL$_SEND_CC_LINE specifies a descriptor of the CC: field text.
    The buffer address field of the item descriptor points to a
    buffer that contains a character string 0 to 255 characters long.

    Specify a value from 0 to 255 in the buffer length field of the
    item descriptor.

 MAIL$_SEND_FROM_LINE

    MAIL$_SEND_FROM_LINE specifies a descriptor of the From: field
    text of the message to be sent. The buffer address field of the
    item descriptor points to a buffer that contains a character
    string 0 to 255 characters long.

    Specify a value from 0 to 255 in the buffer length field of the
    item descriptor.

    Calls to MAIL$SEND_ADD_ATTRIBUTE using this input item code
    should be made before any calls to MAIL$SEND_ADD_ADDRESS.

    The SYSPRV privilege is required to alter the From: of a message.

 MAIL$_SEND_SUBJECT

    MAIL$_SEND_SUBJECT specifies a descriptor of the Subject: field
    text of a message to be sent. The buffer address field of the
    item descriptor points to a buffer that contains a character
    string 0 to 255 characters long.

    Specify a value from 0 to 255 in the buffer length field of the
    item descriptor.

 MAIL$_SEND_TO_LINE

    MAIL$_SEND_TO_LINE specifies a descriptor of the To: field text
    of the message. The buffer address field of the item descriptor
    points to a buffer that receives a character string 0 to 255
    characters long.

    Specify a value from 0 to 255 in the buffer length field of the
    item descriptor.

 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.