Best Practices

  • Use ISA to reverse-proxy web-based mail products, such as OMA and EAS whenever possible.

  • Use a second external IP address, DNS host, and certificate if forms-based authentication for OWA is required to co-exist with OMA, ActiveSync, and RPC-HTTP.

  • Use POP and IMAP sparingly and only when it can be secured through ISA server and when configured to use SSL encryption.

  • Configure the SMTP Screener component to filter both inbound and outbound SMTP traffic where possible.

  • Use a third-party SMTP anti-virus product to further extend the capabilities of ISA's SMTP Screener service.

  • Consider placing Exchange and other messaging servers in a dedicated screened subnet that is secured by an ISA Server.

    Microsoft Internet Security and Acceleration ISA Server 2004 Unleashed
    Microsoft Internet Security and Acceleration (ISA) Server 2004 Unleashed
    ISBN: 067232718X
    EAN: 2147483647
    Year: 2005
    Pages: 216
    Authors: Michael Noel

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