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January 13, 2012 - How does Gray Listing block SPAM, and how do I enable this feature?

The Gray List feature depends on increasing the cost of junkmail mail delivery by taking advantage of the current behavior of most "junkmail servers" in that they don't retry delivery of messages to servers that refuse the connection. Each time a particular sender attempts delivery to a particular recipient from a particular IP address range, Office-Logic InterChange looks for the "triplet" of information in its database. If it is the first attempt, it will be added to the database and the sending server will be given a "451 Server busy. Please try again later." message and the attempt terminated. On the second attempt, if it is found to fall within the time window (i.e., more than 28 seconds and less than 4 hours) the message will be delivered. If it tries too quickly (i.e., less than 28 seconds) it will be rejected as "early", or if more than 4 hours, it will be rejected as "late". Once the triplet is allowed to deliver a message, it will be allowed to deliver without delays unless there is no further attempts for more than 36 days. In which case the process will begin again.  While this mechanism doesn't stop all junkmail and it does cause an initial delay (the amount is dependent on the sending servers operation), it has proven to be very effective at stopping a substantial amount of junkmail.

To enable Gray Listing in Office-Logic InterChange, go to the Configure\Options menu on the Office-Logic InterChange server and select the Junk Mail tab menu.  Click the box to enable the Block junk-mail by forcing multiple inbound delivery attempts (graylisting) option.  Click the OK button to save your settings.

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