Exim Filter Specification - User variables

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## User variables

There are ten user variables with names $n0 -- $n9 that can be incremented by the add 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 $sn0 -- $sn9 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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