In tandem with the growth of the capabilities and reach of
messaging are the security concerns associated with providing
access to these resources. Along with the need to provide
for ???anytime, anywhere??? access to email comes the risks of
opening up the messaging environment to prying eyes.
In response to these threats, ISA Server 2006 provides for a
comprehensive set of tools to secure messaging platforms,
with built-in knowledge to inspect and protect mail traffic
to and from email systems through advanced Applicationlayer
filtering and publishing rules.
This chapter focuses on the best-practice approaches to
securing email-related services (other than OWA) with ISA
Server 2006. Specific step-by-step examples of using ISA to
secure OMA, SMTP, MAPI, POP, IMAP, RPC over HTTP, and
ActiveSync are illustrated and defined. Outlook Web Access
(OWA) deployment scenarios are covered in Chapter 12,
???Securing Outlook Web Access (OWA) Traffic.??? The examples
in this chapter focus on a deployment scenario with
ISA as an edge firewall or inline firewall to an additional
346 CHAPTER 13 Securing Messaging Traffic
firewall product, though the HTTP filtering scenarios can be accomplished with a
unihomed ISA server in the DMZ of a firewall.
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