Hi all, I was wondering if I had an issue with the installation of my 2nd ISA server, or if I am having a routing problem. ISP1 ISP2 | | ISA1 ISA2 | | \-------/ LAN ----- SMTP1 The above (rough) diagram shows that I have two ISP's and an ISA server for each. All traffic is being routed to ISA1 through ISP1, although there is still some traffic on ISA2 via ISP2. So far HTTP server publishing is working correctly, however I am not able to get any combination where SMTP server publishing is functioning. From what I can gather, ISA2 is accepting a SMTP connection, and then ignoring it? Could this be due to the default gateway on SMTP1 being ISA1? Many thanks, Anthony.