Int 16 Fn 4505  - Shamrock Software EMail - Send Result Of User Function   [e]

   AX = 4505h
   DL = port number (01h = COM1)
   DH = error flag
       bit 3: set on error
   ES:BX -> ASCIZ text to return to user, max 1024 bytes

Return: AH = 4Dh if EMAIL installed on specified port
   AL = status
       00h successful
       02h unable to perform function (timeout, prev call not complete)
       other error

Notes: if the error flag in DH is set, the string is not sent and an error
     message is generated instead; if this function is not called within
     five seconds of AX=4504h, EMAIL automatically generates an error
     message
   the string is copied into an internal buffer, allowing this function's
     caller to continue immediately

See Also: AX=4503h,AX=4504h,INT 17/AX=2400h