[sp332]

Reading someone's email without permission is a crime. Nice idea though :)

[justjohn]

You just have to add a clause to the TOS, nobody reads it anyway so you could grant yourself a licence to do anything with their email!

[ken]

Add some fine print in the user agreement, "During sign-up (only) for service X, I hereby authorize web service X to open my inbox and read one (1) email message, if I choose to provide my email account's password as my password for website X."

No longer a federal crime, maybe? Probably still get an angry mob with pitchforks outside your window.