Anti-spam and virus protection
Advanced anti spam and anti virus solutions use additional mechanisms to those you will find in a “standard” email filtering solution in order to accurately and efficiently detect threats. Whereas a standard email filtering solution will include features such as a real-time block lists, Sender Policy Frameworks and Recipient Verification Protocols, plus tools allowing you to set your own acceptable spam thresholds, an advanced anti spam and anti virus solution includes:
Double Anti Virus Software
Double anti virus software does not mean double the protection, but provided the dual anti virus engines are complimentary (i.e. not both proprietary software), you will get a higher malware detection rate than just using a single defense. Advanced anti spam and anti virus solutions typically use proprietary software and open source software in unison.
When a greylisted email has been returned, it goes through a series of secondary processes. One of these processes – SUBRL filtering – checks any URLs contained within the body of the email to ensure they do not appear on a list of URLs registered in previous spam emails. This process significantly reduces the likelihood an employee will fall victim to a phishing attack.
Greylisting is a process in which all incoming emails are returned to their originating mail servers with a request for the email to be resent. Typically this process delays the receipt of emails by a minute or two; but, due to spammers´ mail servers being too busy to respond to the request, spam emails are never returned at all.