Originally Posted by Rob
Cost of all this will be an issue. The clue here is that we run "Small Business Server" and that has a 75 client / user limit. In fact we have about 20 users and are rarely likely to get more than 15 using the network at once since many of those are part time.
It's only an ADSL-Max connection, and our webspace is very much the basic entry level shared hosting services. Thus things like colocation would be way outside of our league and needs. It's really a choice of running stuff locally on the server, having some sort of gateway, or routing all traffic through a third parties service.
Personally, i'd recommend this:
buy a cheap VPS - install exim only, install cPanel - install ASSP (http://www.grscripts.com/
) send all MX entries that way and have all accounts IMAP / POP 3 - probably looking at about £25 a month-ish.