Lemmy Support

I banned a subscriber from one of my communities today for repeatedly breaking the rules. I also blocked them because I find them aggressive and argumentative and I’m not here for that personally. But what happens when their ban from the community ends and they decide to post in the community again? Will I still see their posts as mod? Will I only see them if someone reports them for breaking the rules again? Do I need to unblock users in order to moderate my community properly? Thanks!