Can't join school hub, outside emails are blocked

So, I joined the waitlist for my school district's hub, and it has opened now, but to join my school's hub Discord requires me to verify my school email by typing out a code sent to my school email address. My school district blocks all emails in or out of the school district's domain: emails can only be sent or received to other students/staff with the same @school.org ending. This means that nobody in our school district can receive the verification email to see the code, and so literally nobody in the entire district can join any school hubs.
The only way to resolve this is to request your school district's tech administrators to allow Discord's emails through. So, if nothing else, what email address are these verification emails sent from, so that I can contact my school district's tech department and ask them to whitelist it?

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