Author Archives: Paul Cunningham

I’ve been dealing with spam for a long time now, and even though we see changes every year in the major threats and new techniques that spammers come up with, one of the things that never seems to change are …

Blacklists (or block lists) are a spam prevention technique that uses lists of IP addresses or domain names that are associated with spamming to determine whether to block or allow a particular email transmission. Although the technique falls under one …

I had an interesting discussion with some Exchange administrators a few days ago.  Their solution to spam was to simply configure the Exchange anti-spam settings to send everything over a certain SCL score to the user’s Junk Email folder of …

With all of the attention paid to spam prevention sometimes we forget that viruses and malware remain a strong threat to our business networks. Although in many cases spam and viruses go hand in hand, there are still some viruses …

There is a lot of attention paid to preventing spam and other malicious email content from entering our networks.  But there is a lesser amount of attention given to preventing internal abuse of email systems. The risk of internal email …

If you have looked at Exchange Server’s anti-spam features or taken a peek at the headers of an email sent through an Exchange server you have probably encountered the term SCL before. SCL stands for Spam Confidence Level.  It is …

Some organizations wish to deploy complete end to end redundancy for their Exchange environment, including the outgoing routes to the internet. To achieve this most organizations will simply provision a backup internet connection for their network.  This connection can either …

When the Exchange Server 2010 anti-spam features are enabled and configured they take effect for all mailboxes within the organization.  But sometimes it is necessary to customize the settings for specific mailbox users. Organization-Wide Anti-Spam Settings At the organization level …

Ever since the first email viruses appeared the risk of file attachments in emails has been an important one for businesses to take seriously. To make it possible to manage this risk Exchange Server 2010 includes the feature to block …

A “catch all” email address is a mailbox that is configured to receive any emails that are sent to addresses that do not match a real, valid recipient. Catch all addresses are popular in a few different scenarios and for …