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[FW-1] how to config FW for exchange?



Dear all:

I have config as follow:

MAIL (192.168.0.30) Mapped (X.X.X.30)
SERVER--------------(192.168.0.254) FW-1(4.1) (X.X X.254) -Router-Internet
                                    |
LAN Clients              |
(192.168.0.0/24)----|
Which use FW1 as gateway and we have a valid class C

Policy:
Any > MAIL > SMTP/POP3 > Accept

Problem is:
Client (Outlook Express) using MAIL(valid address) cannot send mail
using NetBIOS name (MAIL) / 192.168.0.30, then OK.
Can anyone help? because lastly we config every client using MAIL (Valid)
and it placed outside FW
P.S.  1. The other client outside (any other at internet) had no problem
when sending and receiving mail
          2. Telnet MAIL(Valid) 25 (client behind FW) host not found,
               Telnet 192.168.0.30 25 ok!

Regards,
A true novice, Wat.

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