windows-based mail server

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hey, i'm looking at setting up a mail server on my windows box to try and cut out some of the spam i'm getting. can anyone recommend anything to me? the most important thing is spam/virus-checking capabilities, and if there's any open-source/freeware ones that do a good job, i'd be interested in those!

thanks in advance

 

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thing is it's going to be easier to run it from a server as everyone has the same domain email, so i won't have to do this on every computer in the house.

does anyone else know of a mail server app?