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Are these going to be actual mailing list topics? Note, if topics are set then everything which doesn't fit into a topic is implicitly less important, because one can only receive those messages by not filtering the list by topic at all.
And my point is: some people would like to only follow discussions of wiki statistics (collection and interpretation), but not all the technical topics here. Tags would certainly be useful for email filters, but not for mailman topics. This may be a problem or not, just noting. --Nemo 21:19, 23 February 2015 (UTC)