How do I keep up-to-date on reactions in a discussion (thread)?
Above every Thread is a 'check box' followed by the text: Email me when someone replies to this thread. By checking this box, you will receive a message at the e-mail address you provided as soon as someone places a reaction in this Thread.
This option can be turned on or off for each Thread at any time. But in order to be able to do that, the option "Turn on e-mail tracking" must be checked.