Knowledgebase
Understanding Proofpoint Essential's Mail Flow

Messages processed through Proofpoint Essentials go through various stages in a particular order which is outlined below for both inbound and outbound.

Inbound Mail Flow:

  1. PDR - Proofpoint Dynamic Reputation
  2. Attachment Defense (if licensed)
  3. Anti-Virus scanning
  4. Image Analyzer (if licensed)
  5. Filters: Custom filters and send lists.
    - Executables such as .exe, .dll, .bat, .js, and others are blocked before custom filters.
    - Any filter that triggers with "Quarantine" or "Allow" will skip the Anti-Spam step of processing
  6. Anti-Spam
  7. URL Defense Scan and Rewrites (if licensed)

Outound Mail Flow:

  1. Attachment Defense (if licensed)
  2. Anti-Virus scanning
  3. Image Analyzer (if licensed)
  4. Filters: Custom filters and send lists
    - Executables such as .exe, .dll, .bat, .js, and others are blocked before custom filters.
    - Any filter that triggers with "Quarantine" or "Allow" will skip the Anti-Spam step of processing
  5. Anti-Spam
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