On Tue, 23 Oct 2012 19:51:57 +0000 (UTC), Doug Freyburger
> wrote:

> My filter blocks based on number of cross postings. Some high noise
> groups I drop all cross posted messages. Trolls add cross posts to off
> topic groups hoping to generate replies by people who do not notice the
> addition. At the moment I use a reader that asks me to confirm any
> cross post by me and offers to only post to the group I'm reading.

When I reply, my reader notifies me immediately when a post is
crossposted and I have the option of replying just to the group, to
all groups or I can modify the groups.
>
> I also filter based on the names of groups in the list. Numerous
> groups are troll magnets. Plus I filter anonymizers, certain rogue
> servers that are known to host a high percentage of trolls. I also use
> the !ignore verb to drop all responses to certain known trolls.

You filter by domain? I haven't done that very much, but I do filter
out trolls the same way I filter out every other poster I don't want
to see. Admittedly, some are harder to filter out than others but I
just go to the ng that deals with my reader and they've told me how to
filter say, symbols or changing numbers in the name.

--
I take life with a grain of salt, a slice of lemon and a shot of tequila