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<TITLE>Exim Filter Specification - User variables</TITLE>
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<H2><A NAME="SEC9" HREF="filter_toc.html#TOC9">User variables</A></H2>
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There are ten user variables with names $<EM>n0</EM> -- $<EM>n9</EM> that can be
incremented by the <EM>add</EM> command (see section 11). These can be used for
`scoring' messages in various ways. If Exim is configured to run a `system
filter' on every message, the values left in these variables are copied into
the variables $<EM>sn0</EM> -- $<EM>sn9</EM> at the end of the system filter, thus making
them available to users' filter files. How these values are used is entirely up
to the individual installation.
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