NMJ GuardianMail™ is a spam and virus scanning service for your email system. It is compatible with most email servers, but is especially important for businesses that have onsite server or servers. The email destined for your system is first sent through a series of scanners and products looking for known spam, suspected spam, and virus infected email, and prevents that mail from being delivered to your mail servers. Each user in your business can review mail that has been held and choose to release it. Virus infected mail is always blocked.