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Gnus Manual

1.6.3 Filtering New Groups

A nice and portable way to control which new newsgroups should be subscribed (or ignored) is to put an options line at the start of the `.newsrc' file. Here's an example:

options -n !alt.all !rec.all sci.all

This line obviously belongs to a serious-minded intellectual scientific person (or she may just be plain old boring), because it says that all groups that have names beginning with `alt' and `rec' should be ignored, and all groups with names beginning with `sci' should be subscribed. Gnus will not use the normal subscription method for subscribing these groups. gnus-subscribe-options-newsgroup-method is used instead. This variable defaults to gnus-subscribe-alphabetically.

If you don't want to mess with your `.newsrc' file, you can just set the two variables gnus-options-subscribe and gnus-options-not-subscribe. These two variables do exactly the same as the `.newsrc' `options -n' trick. Both are regexps, and if the new group matches the former, it will be unconditionally subscribed, and if it matches the latter, it will be ignored.

Yet another variable that meddles here is gnus-auto-subscribed-groups. It works exactly like gnus-options-subscribe, and is therefore really superfluous, but I thought it would be nice to have two of these. This variable is more meant for setting some ground rules, while the other variable is used more for user fiddling. By default this variable makes all new groups that come from mail back ends (nnml, nnbabyl, nnfolder, nnmbox, and nnmh) subscribed. If you don't like that, just set this variable to nil.

New groups that match this regexp are subscribed using gnus-subscribe-options-newsgroup-method.