How to allow traffic other than http

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I have servers set up as diagramed below.  Proxied web traffic work fine.
Email fails.
I can send mail from the Linux box via Pine.  Email server is at external
ISP.

+------------------------+
|                        |
|  DirectWay Satellite   |
|                        |
+------------------------+
            |
            |        +------------------------+
            |        | Windows 2000 Pro       |
            |        |                        |
            |        | 10.111.45.249          |
            +--------------------------       |
                     | 255.255.255.0  |       |
                     |                |       |
                     |            NAT/DHCP    |  Connection Shared using W2K
wizard
                     | 192.168.0.1    |       |
            +--------------------------       |
            |        | 255.255.255.0          |
            |        +------------------------+
     Cross-Over Cable
            |        +------------------------+
            |        |     Redhat 7.3         |
            |        |  DHCP (192.168.0.x)    |
            +--------------------------       |  Squid Proxy
                     |  255.255.255.0         |  Dan's Guardian web filter
                     |                        |
                     |  192.168.254.250       |
            +--------------------------       |
            |        |  255.255.0.0           |
            |        |                        |
            |        +------------------------+
            |
            |
+-----------+-------------+
|          Hub            |
|                         |
+--+---------+------------+
   |         |
   |    +----+------------+
   |    | Wintel Clients  | Default Gateway = 192.168.254.250
   |    +-----------------+
   |
   |    +-----------------+
   |    | Win2K Server    |
   |    | 192.168.254.254 |
   +----+---------------  |  DHCP Server
        | 255.255.0.0     |
        |                 |
        +-----------------+



Glen Spidal
Cybercorp Computers, Hillsboro Oregon
PH: 503-681-9786  FX: 503-615-2936
www.cybercorpinc.com




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