Sieve matching "size" with user variable?

[Ralph Seichter]

* Ed W. via dovecot:

> My goal is that users can set a user configurable setting (in an
> external front end) and if the email size is greater than this size
> then we will do some processing on it. This particular filter is
> actually in a global sieve filter.

A global script using per-user parameters? Not what I would choose. I
like to generate sieve scripts for individual users (taking their wishes
into account of course), because it gives me the ability to perform some
sanity checks.

-Ralph