Having ranted a little at Telewest for not sorting out their customer base and fixing the problem they did give me a smart host I could use for routing my mail, an IP that wasn't in the blacklist. Previsouly we had tried to route as much mail directly using DNS but this has forced our hand so now we have to set a smart host.

A quick change from 'Use DNS to route....' to 'Forward al mail through....' and setting the IP/DNS name in the field below and all mail was now going out through a new route and more importantly wasn't getting thrown into the big at the other end.
If only ISPs took a hard line on users closing open relays.
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