VPOP3, a UK product from Paul Smith Computer Services, comes in two main versions: standard and Enterprise. The main difference between the two is that the Enterprise version accepts plug-ins that enable virus-scanning, content filtering and SMS messaging. In addition, the Enterprise version supports real-time blacklist checking to minimise spam, as well as IMAP4 and ODBC. Both are downloadable in 30-day trial versions. There’s also a simplified Home version with reduced business functionality (no listserver, external auto-responders, LAN forwarding and so on).