INT 92 - Da Vinci eMail Dispatcher - "NetSubmitName"
        AX = E10Dh
        BX = 0006h
        CX:DX -> parameter block (see below)
Return: AX = status (see AH=E1h)
Note:   this function is used to verify username/password

Format of parameter block:
Offset  Size    Description
 00h    WORD    segment of uppercase password string
 02h    WORD    offset of uppercase password string
 04h    WORD    segment of uppercase username string
 06h    WORD    offset of uppercase username string
 08h    WORD    segment of "DVSEMAIL"
 0Ah    WORD    offset of "DVSEMAIL"