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