Exim Filter Specification section 9

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## 9. User variables

There are ten user variables with names `$n0` - `$n9` that can be incremented by the `add` command (see section 12). 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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