Discourse and mailing list mode?

For what it’s worth, the filters I use in Gmail for threads I don’t want to read straight away are:

Subject: [Communities/Norge (Norway)]
(for example)

Skip Inbox, Apply label "osm_read_later"
(where "osm_read_later" is a label / folder I've previously created)

You can also filter users via:

from:(SomenameIwanttofilter via OpenStreetMap Community <community@noreply.openstreetmap.org>)

The “big thing” that doesn’t work is in-category threading (see discussions and workarounds elsewhere), but that’s just as much an issue at Discourse itself as it is by email.