Apparently there are some people who keep responding (or trying to) to me and I can't see their posts because I have them muted. Sometimes they keep responding as if I'm talking to them.
Do they know they are muted?
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It's also possible to check if you're muted through the PM system. If I mute you, you won't be able to PM me (you'll get an error message). But when you initially mute someone, they aren't notified.