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In that regard though, it's not different to existing throwaway email services. I'd use this sort of thing for registering for annoying things like "free" wifi.

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Most free wifi hotspots don't verify your email fyi

To some extent, they can't. (How do you verify the email without being on the wifi?)

some may allow popoular e-mail services (and imap/pop3 ports) traffic, while blocking the others

other captive portals let user in, ostensibly to open inbox and click the link, then kick off the net if that didn't happen within 5 minutes.

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