I am trying to decide which path to take.
We have about 30 PCs and each one has some kind of Anti-Virus protection.
I would like to install an email server.
The server will download all emails from our ISP, then scan all emails, then wait for the users to ask for their email…

What email server do you recommend?
And , which Anti-virus company?

Why? The cost of the server and one copy of Anti-Virus vs cost of 30 copies of Anti-Virus
Thanks