212.173.132.2 is ALSO the address of our intranet, it's served from the same server and mailgate.sidcot.co.uk resolves to this IP. I have stopped the intranet server but no improvement.
My guess here is that you have a firewall that is blocking the packets -- upon inspection with a packet sniffer, it seems that packets to 212.173.132.2 port 25 are being dropped (with no response coming back), whereas if IMail was blocking the connection, it would send back some response packets.
-Scott
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