Part Three: External Hosts, Lists

The third part of the policy script continues to handle messages from external hosts previously filtered in Part Two: External Hosts. Specifically, this part of the policy filters messages on whitelisted relays, anti-spam opt-out lists, and blacklisted relays. The Manager screen shot shows where to edit list-checking rules and actions for messages from external hosts. A step-by-step description of this part of the policy is provided below.

Description:

Messages reaching this part of the policy script are from external hosts and have been previously scanned for viruses and suspect attachments. These contagion-free messages are now checked for membership on whitelists, blacklists, and anti-spam opt-out lists, as follows:

  1. If the message originates from a Relay defined in the Whitelisted Hosts list or the message has an Envelope From address defined in the Whitelisted Senders list or Whitelisted Senders (per-user) list:
    • The message is delivered.
    • A mark is added to the message log indicating that the message originated from a whitelisted address.
    • Message processing stops.
  2. If the message recipient address is defined in the Anti-Spam Opt-Out list:
    • The message is delivered.
    • A mark is added to the message log indicating that the recipient is a member of the Anti-Spam Opt-Out list.
    • Message processing continues for recipients who are not defined in the Anti-Spam Opt-Out list. (If all recipients are included in the list, message processing stops.)
  3. If the message originates from a Relay defined in the Blacklisted Hosts list or the message has an Envelope From address defined in the Blacklisted Senders list or Blacklisted Senders (per-user) list:
    • The message is quarantined with the reason "Blacklisted".
    • A mark is added to the message log indicating that the message originated from a blacklisted address.
    • Message processing stops.