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So, after not= a second filter (simple filter or regexp) can be specified - if the main filter matches the address the second filter will be tested. Only addresses where the main filter matches but the second doesn't are accepted. This is sort of a local exception rule.
A restriction: this option must be the last option specified (a filter can contain commas, these will be considered part of the filter rather than option separators).
What do subscription authors think about this? Is this useful? Is this too complex?