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How it works
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Step A: Check if something in the messages is excluded
( e-mail address, IP address, hostname, subject, text or white list )
If so, proceed with step D
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Step B: Evaluate all methods ( assuming the message is not excluded for that method ) and build a list of failed methods
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Step C: Calculate which action of the failed methods of step B has the highest priority
The method priority is:
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Address
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IP/Host
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DSN
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Subject
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Text
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HTML
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Attachment
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Exploit
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CCS
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SLS/RBL
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Country
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Bayes
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Heuristic
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Header
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BCC
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Internal From
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Faked From
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Faked MX
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SPF
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SURBL
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Charset
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Auto IP
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Backscatter
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User Defined Method
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Absolute Block
The action priority is:
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Discard message
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Send a non-delivery report to the sender
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Encapsulate and forward to Postmaster
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Forward to Postmaster
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Encapsulate and send to recipient
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Encapsulate and send to recipient without attachments
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Mark subject and move to Junk-E-Mail folder
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Mark subject
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Forward to recipient
If the action is Discard message or Send a non-delivery report to the sender then proceed with step E, else proceed with step D
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Step D: Scan the message for a virus.
If the message has no virus or there is no virus scanner available, then send the message to Exchange
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Step E: Perform the action that was calculated in step C
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