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	Overview The Spam Flag More Mail Headers

	Spam Screening at MIT Email at MIT The Apace SpamAssassin Project

MIT Spam Screening: Headers

Overview

When email messages arrive at MIT they are tested by a set of criteria, assigned a spam ranking score, and designated spam or not. This result, and other information, is encoded in the headers of each message. You can use these headers to set up personalized filtering.

For more information on the technical details of spam testing visit the Spam Assassin project.

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The Spam Flag

Messages determined to be spam, that scored higher than the set threshold for spam, are given the following header:

X-Spam-Flag: YES

You can personalize your spam threshold to make it more or less sensitive to spam. Additional information is included in other mail headers is outlined below.

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More Mail Headers

Email received <@mit.edu> contains the following additional headers:

X-Spam-Flag:	[YES \| NO]
X-Spam-Score:	[single precision decimal score and user's score limit]
X-Spam-Level:	[asterisk indicator displaying the spam severity of the message] -- This level will not appear if mail scores a level below 1.
X-Scanned-By:	[a version number and URL] -- Tag included as part of the software package.
X-Spam-Not-Checked:	[messages over 100K are not checked]

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