Microsoft® Exchange Server 2003 Unleashed

Combating Spam

Spam is a global problem that affects everyone with an Internet-accessible email address. It is not just a frustration anymore; it affects many things including an organization's ability to be productive among other things. In Chapters 11 and Chapter 13, “Transport-Level Security,” many methods and features such as blocking attachments, filtering, and preventing Web beaconing were examined to help prevent spam in the organization. To continue with that examination, the following sections describe common best practices to minimize or alleviate spam.

Use Blacklists

Many companies are unknowingly serving as open relays, which aid spammers by essentially permitting them to use the company's messaging system for unsolicited email. When ...