Ideas on in-house email filtering appliance

Hi All,

I just wanted to get some thoughts on a solution for an in-house email security appliance. Right now we are using a hosted service that is provided by our consultants. It is a Barracuda email appliance, but the price for the service is going up and we wanted to compare all our options as far as bringing it in-house. We are a church, so we would be working with a very lean budget. Presently, in-house, we have a server with 3 VM's and one of those VM's is an Exchange 2010 server. Looking to hear about your experiences and suggestions.

Thanks