As far as I understand it you don't need to do that - if you turn on mailing-list mode (in Profile > Preferences > Emails) then you can filter things out rather than in. It's under Profile > Preferences > Notifications.
I was quite wary of the move to the forum, and as far as I can tell the ideological/cultural/legal/CoC (etc) issues that many people here were concerned about haven't really changed. But for anyone who hasn't signed up simply because they don't like web forums: having tried it out and set it all up, I find that mailing list mode does work pretty well, with the additional benefit that you can filter out topics/categories/users you don't want to read. The main downside that I can see is that it only does HTML and not plain text emails. Apart from that though it now appears to me as a mailing list, with individual messages that I receive, read and can reply to by mail, and it has worked just fine for me so far. You can't do all the upvoting and liking and following etc that forums provide if you use it exclusively in mailing-list mode, but obviously that's not possible on a mailing list anyway, so it doesn't seem a big sacrifice.
Cheers
i