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Re:Show HN: MailRubber, a condom for your email address by chickopozo on Monday April 08, 2013 @06:45PM (#5515185)
This has existed for years: http://www.google.com/recaptcha/mailhide/

And your email isn't stored but rather encrypted and the ciphertext passed via the url.

Re:Show HN: MailRubber, a condom for your email address by chickopozo on Monday April 08, 2013 @06:47PM (#5515195)
http://www.google.com/recaptcha/mailhide/d?k=01eHy-6e8CKpz-d...

k is your id and c is the ciphertext the key is stored on their server.