Although all of us Exchange administrators would like to have Exchange as the sole mail server, sometimes more SMTP mailers exist. The following article explains how to configure Exchange to relay mail for these systems.
Virus, Trojan and denial of service attacks are quite common these days and Exchange is a popular target for these attacks due its popularity and inherent vulnerabilities. Mail relays can be used to thwart most attacks. I'm constantly discovering that although the concept of mail relays is not new they can be used against the latest sophisticated attacks, just long as they're not the weakest link in the chain of e-mail delivery.
With Exchange 2000 SP2 Microsoft added a feature, known as segmentation, that allows you to quite easily make some rather major changes to the appearance and functionality of OWA.
Not everyone has managed to migrate to Exchange 2000 yet, while others choose to ignore it completely, and continue using Exchange 5.5. Meanwhile, Microsoft has introduced a new upgrade – the 2003. This is related to the appearance of a new MS Windows 2003 version, the operating system to provide a really good tandem with Exchange 2003. As we will see further on, when using Exchange 2003 without combining it with Windows 2003, it loses most of its functionality.
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