email being rejjjcted fro unknown domains

[Lance Haig]

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Hi,

me again ;-)

I have just setup  my new MS box ( replacing the one I had under my desk 
at home with one in a hosted facility)

I have set one of my test domains to point to the new IP and when I send 
mail I get the following error.

reject=553 5.1.8 <Lance.Haig at domain.com>... Domain of sender address 
Lance.Haig at domain.com does not exist.

Where is MS checking this? I know he address exists that I am sending 
from as it is my work address and we do not get mail stopped by other 
scanners.

have I enabled something that is killing mail like this?

I would appreciate any help.

Thanks

Lance

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