At home where I have a dsl internet connection I set up a small debian 3.0 server to work - above all - as a gateway & IPTABLES firewall (masqueranding the 2 windows 2000 PCs which are connected to it) and connecting to the net via a "ppp on demand".
Recently I have installed the uw-imapd & fetchmail debs to make M$ outlook express in the win2k box read mail (got by fetchmail through pop3 from my external ISP) from the imap server (the small debian 3 box again!). Now I DON'T want that from the outside world, from the Internet via ppp0 someone could access my imap server which is on duty for my internal network only. What IPTABLES lines should I add to my firewall to avoid these intrusions? Vittorio
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