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 : Refuse, Block, Tag or Route to DeadLetter Mailbox
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Previous Section Keeping Spam Email out of Your Network Identify Suspect Messages Next Section
JSpamFilter handles mail in essentially one of three ways:

Block, Tag and Forward, or Forward Untouched
Red Light: Block or Refuse Block: Messages are blocked in effectively three ways as well: the connection can be refused, or the connection can be dropped after determining through a DNSBL look-up that it comes from a black-listed server, or the message can be sent to a Dead Letter Mailbox. Refusing the connection is stronger than dropping the connection in that the "drop" can be over-ridden by filter scores, whereas a refusal is pre-emptive.
Yellow Light: Tag and Forward Tag: Messages that are found to likely be spam, but fall in the "grey area", have their subject lines tagged with [JSpamFilter] and are forwarded to the user to be sorted using email client rules and filters for convenient analysis. This lets the end-user have their own "quarantine" which reduces clutter in their inbox, avoids false positives, and eliminates the inconvenience of logging into remote email quarantines as with a spam email filtering service.
Green Light: Forward Untouched Forward Clean: Messages that are found to be clean are forwarded untouched. Note that JSpamFilter does not employ a store-and-forward mechanism, all processes are done essentially in real-time.
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