> URI rules > META rules > Use of PERL IF expressions in SA rules. > CF processing algorithm
Matt Kettler's howto at http://mywebpages.comcast.net/mkettler/sa/SA-rules-howto.txt doesn't cover these, unfortunately.
Correct, I do however reference these rule types and point the reader in a general direction as to where to get information about them.
(self-quote from the guide:)
More information on the different rule-writing keywords that can be used to write more
advanced rules, such as rawbody, meta, and uri can be found in the Mail::SpamAssassin::Conf
manpage. You can also glean some great examples by reading through the default rules in
/usr/share/spamassassin.
So although I don't cover them directly, I've got a short pointer in there.
Although the docs are a bit terse, they do at least explain what these do.
The best sense I have about META rules is that they're used to combine two or more other matches; example from
More or less.. meta rules allow you to do a variety of boolean expressions based on combinations of rules. The boolean syntax used is similar to that of C, and many other programing languages.
The format of the boolean operators isn't in the manpage, but they are very common, so the man page writer seems to have assumed that anyone writing meta rules has a basic understanding of boolean expressions. Here's a short intro:
|| is a boolean OR operator... so TEST1 || TEST2 reads as "true if either TEST1 or TEST2 are true"
&& is a boolean AND operator
! is a boolean negation (NOT).
() are used to force grouping of operations, just like in ordinary algebra.
Thus the example in the manpage: meta META1 TEST1 && !(TEST2 || TEST3)
Is true if TEST1 matches, and neither TEST2 nor TEST3 match.
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