The list of these products keeps growing over time, but they can be found
at the following URL:
http://www.microsoft.com/isaserver/partners/contentsecurity.mspx
With the addition of one of these third-party extensions to the SMTP filter, the capabilities
of ISA Server can be further extended to include enterprise SMTP virus scanning and
content filtering.
Enabling Outbound and Inbound SMTP Filtering
Several different varieties of SMTP rules can be set up on the ISA server for SMTP filtering,
depending on the type of traffic that will be allowed, such as the following:
. Inbound SMTP filtering??”Inbound SMTP filtering is the most common type of
SMTP filtering deployed. The primary security need for organizations with SMTP
mail is to secure the anonymous email traffic coming into their networks from the
untrusted Internet. At a minimum, inbound SMTP filtering should be enabled.
. Outbound SMTP filtering??”Outbound SMTP filtering is becoming more important.
Organizations are finding that they are being held liable for internal employees
launching attacks and sending spam (often without their knowledge) to external
employees.
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