Graymail describes email messages that are generally unwanted, but do not fit the definition of spam. Unlike spam, graymail includes messages from mailing lists and newsletters that you have legitimately signed up to receive. Over time, these messages can begin to clutter your inbox and can easily be mistaken for spam.
The term graymail was coined by the Microsoft Hotmail team in 2011, when the company introduced new methods of filtering incoming messages. Graymail differs from spam in the following ways:
Based on Microsofts research, newsletters and special offers make up the majority of messages in the average users inbox. By identifying these messages as graymail, Hotmail is able to filter them appropriately. This includes moving newsletters to a specific Newsletters category and providing a Schedule Cleanup tool that moves or deletes outdated email promotions.

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