Mobility Investigate

What Is Grey Listing?

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Executive Summary

Greylisting is a new method of blocking significant amounts of spam at the mailserver level, but without resorting to heavyweight statistical analysis or other heuristical (and error-prone) approaches. Consequently, implementations are fairly lightweight, and may even decrease network traffic and processor load on one's mailserver. The term Greylisting is meant to describe a general method of blocking spam based on the behaviour of the sending server, rather than the content of the messages. Greylisting does not refer to any particular implementation of these methods. Consequently, there is no single Greylisting product.

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