Hi @MartinS -
Great question! The community notification settings are a little complicated and finicky.
I *think* this will work for what you're looking for: From My Settings > Subscriptions & Notifications > Notification Settings (here), on the "For my forum subscriptions, notify me for" option, select "Only the first post in each topic" (screenshot)

Additionally, UNCHECK the option "Any comments on the knowledge base articles, blog articles or events in boards I subscribe to"

Try this and let us know how it goes.
Cheers!
Caroline S | Community Manager, Cisco Meraki
New to the community? Get started here