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It seems like they're detecting browser user agent (and possibly IP)

I'm not going to abuse this myself, but at MIT you can create seemingly-unlimited @mit.edu email addresses using Moira.

Getting a bunch of fresh IPs might be trickier, but you could probably wander around different WiFi access points, use the CSAIL OpenStack installation, or maybe just renew a DHCP lease a bunch.

User-agents a easy to find and change with a browser extension (or scripting).

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