That depends entirely on the services you intend to offer. IMAP requires TCP-143 News (NNTP) requires TCP-119. Exchange connectivity requires RPC packet filters (lots of them). Is the Exchange server still tied to a domain? Jim Harrison MCP(2K), A+, Network+, PCG ----- Original Message ----- From: Aleksander França Honma To: [ISAserver.org Discussion List] Sent: Monday, October 01, 2001 5:54 AM Subject: [isalist] MS Exchange sitting in the DMZ http://www.ISAserver.org I know that placing a Exchange 2K box in the DMZ is big headache, and that the gains not always worth the hard work. But what a about a Exchange 5.5 box? What's really involved? Besides SMTP's and POP's which other ports would I have to leave open ? Many tks in advance, Aleksander França Honma ------------------------------------------------------ You are currently subscribed to this ISAserver.org Discussion List as: jim@xxxxxxxxxxxx To unsubscribe send a blank email to $subst('Email.Unsub')