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ipmasq diald and mail



Hi
 I'm trying to configure my linux-box (RedHat4.2, 2.0.33) as a server.

my net is :

local net
(192.9.200.x)
    |
    |      ------          ------------
    |     |Linux |        | ISP with   |
    |-----|Box   |--------| Dynamic-IP |---- internet
    |     |192.9.|        | via PPP    |
    |     |200.7 |        |            |
    |      ------          ------------

I'm trying to build my linux box as a firewall
It should connect to the internet via PPP using diald
( I've already configured diald successfully )
I'm trying to use squid as a proxy and either
sendmail or qmail as mail server ( which is better ?
easyer to config ? safer ? )

I've read the ipmasq mini HOWTO but still have trouble
to understand more then the basic of ip-masq.
( to what ports does it redirect inside computers,
  how does it know who is inside the firewall and who
  is outside. what parameters do i use with ipfwadm )
I have basic Idea of ipfwadm, but only for non ip-masq
purpuses. ( -I -O and -F ).

any info, help , pointers will be welcome

Thanks
Erez
erez@savan.com