exchange server

Hello, i have a problem, i have exchange installed on my server, along with my webserver as well.

i can send emails using administrator@thedigitaldream.co.uk (mydomain) using outlook and they get to the recipiant fine.

But, if they send an email back, postmaster@thedigitaldream.co.uk replies saying that the message failed?

does anyone know what could be wrong?

Thanx

 

 

 

 

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