I work for a small company that has their email services hosted by an online email provider (at a very cheap cost). I can access and manage all the mail accounts from a web interface and then configure Microsoft Outlook on all the desktops for users to send/receive mail, from the offsite mail server.

The problem is the mail server that my company's email is hosted on has no type of virus or firewall protection. Basically it's wide open, the only feature I'm able to configure is a cheap spam filter. I spoke several times to this ISP and voiced my concerns about this problem and they are just now in the process of upgrading their services and offering some type of virus protection.

Other than switching to a different mail provider (which I know the company may not do because they're cheap) what can you suggest as a good measure to effectively increase security when they download emails at their desktops via Outlook. Right now they are having all sorts of issues with spam, spyware, adware, and trojans. Are there any free gateway type of services that would provide a means to scan all email before it gets to my companies network or any utilities I can install on all the desktops to minimize these security threats. Any ideas please let me know, thanks!