If you aren't getting your activation email after 10 minutes or so, let an admin know on the Discord. Some email providers (Gmail, Outlook) are bouncing.
I'm currently investigating this issue. From what I can see so far, it seems like Google (and probably Microsoft as well, in addition to just having blacklisted our server's IP) is having trouble retrieving any up-to--date and proper version of our email-related DNS records. I've updated them again, hopefully Google's email servers pick them up by tomorrow.