Tag Archives: Exchange Server

When planning an email security solution many organizations put a lot of thought and effort into protecting their environment from external threats.  They use such measures as blocklists and content filtering to prevent spam from reaching end user mailboxes. Despite …

Most organisations that have deployed an email anti-spam solution will at some stage encounter a situation in which a false positive (legitimate email blocked as spam) or a false negative (spam email allowed to pass through) causes a problem for …

In recent posts I’ve written about how to configure and manage Exchange Server 2007 anti-spam features such as connection filtering, content filtering, quarantine, and directory harvest protection. Each of these features carries a variety of advantages and disadvantages.  A consistent …

Bayesian spam filtering is a technique used to classify email as spam based on the contents of the email message.  This is similar to other forms of Exchange content filtering with one important distinction – standard content filtering uses a …

Exchange Server 2007 anti-spam functionality includes the Content Filter agent which is designed to provide spam detection based on the contents of an email message. The Connection Filter agent is based on the Intelligent Message Filter first introduced in Exchange …

Exchange Server 2007 includes integrated anti-spam features that run on Edge Transport servers and can optionally be enabled on Hub Transport servers.  In this blog post I will discuss the Connection Filter agent and how IP block list providers can be used to …

Directory Harvesting is a term used to describe a technique used by spammers to discover valid email addresses, usually targeting corporate networks. Spammers try to use this technique to trick an email system into telling them which email addresses are …

As every experienced network administrator knows, standardization lowers the total cost of ownership. Creating standards lowers helpdesk support calls and facilitates easier maintenance. Companies establish standards for everyone using the same software and hardware. Server hardware configurations are standard for …

GFI MailEssentials does an excellent job of leveraging third party blacklists such as ORDB, SpamHaus, Spamcop. This tool protects your email users from receiving spam. What do you do, if your company email server gets blacklisted? “No way” you say. …

Even though Exchange 2007 has been released for a while, I thought it would be worthwhile spending a moment on Exchange 2003 spam features, especially due to the large amounts of Small Business Server users still on SBS 2003 with …