Mail Control

Hello, I have a question, and I do not know if this is the right mailling list. I have a LAN of 10 Win98 PC, 1 Suse Squid, Samba, Masquare (iptables) and Gateway server.. The server's eth0 points to LAN, eth1 points to ADSL Modem .. They have no access directly to internet.. all the connection passes through the Suse server. One of the PC is sending mail, and I want to count how many e-mail that PC sending out at what time, and to whom, and if possible I want to check/see the content of the e-mails. Since there is no local mail server, I can not copy/re-direct any incoming and outgoing mails. Anyways, is there a way to solve my problems. I can check the packets but I want to see what the pc is sending out.. Cheers ARiF