can't unsubscribe from discussion
I get emails about "Pas si vite" discussion but I'm not subscribed to it anymore and when I click the unfollow link in the email it says page not found.
Settings » Notifications
Then choose the one you want to receive e-mails for.
I want to get emails for other discussions I am following so I can't see how that helps.
Does the discussion still exist? If so, have you tried clicking the "Following Discussion" button at the top?
I don't know how I would find it. A search in Duolingo discussions yields 162507 results.
Have you tried clicking "Discussion" and then the "Followed" tab? (next to "popular" and "new") All the discussions you've followed at some point should be there, so you can find it and click unfollow - like Lenkvist suggested.
That's the first thing I tried. It's not in my list of followed discussions but I still get the emails.