Longer-term discussions happen on our MDN discussion forum. You can post to the forum via email to mdn@mozilla-community.org. If you join the forum, you can choose to have notifications about discussions sent to you via email as well.
Setting up your email notifications for Discourse is documented in “How do I use Discourse via email”. If you still have problems after looking at that article, the Meta category is the place to discuss general problems with using Mozilla’s Discourse site.
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