I have setup surgemail as a bastion host for 5 of our primary domains. We tried every other mail server out there trying to find something that works and that could keep up with our mail throughput.
If you are looking for a reliable and FAST mail server, BUY SURGEMAIL!
I have NEVER had the responsiveness that Net Win provides!The technical support is the best I have ever worked with. They do NOT give up, they help you all the way ! Even before the purchase !