I'm not sure If I'm missing something or not, but is there no way to have an email notify one when a topic is replied to? I don't see the option anywhere. Unless you get an email for a reply to a watched topic?
Yeah, you would add it to your Watched Topics list. If you want to be emailed, be sure the box is checked in your Preferences: "By default should anything added to your Watch Lists be emailed to you?"
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You'll need to update the entries for your already-added watched topics however to indicate you want them to email you (afaik) as this setting only effects those which are newly (after this setting is applied) added watched topics.