Message hygiene principles for Microsoft Exchange Server

Whilst researching my post on the Microsoft Exchange intelligent message filter a couple of months back, I came across the following message hygiene architectural principles, which Microsoft promotes as best practice:

  • Anti-spam filtering must be performed before anti-virus filtering.
  • Anti-spam filtering should be performed for inbound mail only.
  • Anti-spam filtering should remove messages (cf. quarantining messages).
  • Anti-virus filtering must scan both inbound and outbound mail.
  • Anti-virus filtering must be mail-direction aware.
  • Anti-virus filtering must block messages that it cannot scan.
  • Anti-virus and anti-spam filtering system must integrate with Exchange Server.

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