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Appendix A
Mail headers added by CanIt-PRO
CanIt-PRO adds several headers to an email message containing details of the filtering tests performed
on the message. This chapter lists these headers and describes their contents.
A.1
General Headers
A.1.1
X-Spam-Score
This header contains combined details of all tests performed by CanIt-PRO. It has two general forms.
The first is for messages that get fully scanned and scored, and the second is formessages that bypass
the standard scoring.
The first form is the most common, and appears as:
X-Spam-Score:
5.2 (*****) [Tag at 5.0] HTML MESSAGE,234(0.5),RBL(spamrbl.example.com,1.0)
In this form, the header contains the score as a number, followed by zero or more stars indicating the
spamminess in ( ) brackets, and what the nearest hold or tag threshold was, in [ ] brackets.
At the end of the line is a list of tests that were triggered by this message. As of the current release,
these are the possible contents of this test list:
• SpamAssassin rule hit (e.g. HTML MESSAGE)
This shows a SpamAssassin rule hit. They will appear first in the list of tests, and generally
consist of all uppercase letters, digits, and underscore ( ). The list of possible rules is too long
to describe in this document.
• Custom Rule hit (e.g. 234(0.5))
This shows a Custom Rule hit, and takes the form of
rule-number(rule-score)
The rule-number number is unique within a CanIt-PRO installation across all streams, and may
identify a rule in the current stream or any of its parents.
• Mismatch Rule hit
CanIt-PRO — Roaring Penguin Software Inc.
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