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People have reported to us that when they have a URL (link) sent to them, the mail does not always arrive. This is because some Internet Service Providers block e-mails that contain links as they are often spam. So you should leave the "Send me a Code Instead of a link" box checked. You will then get a plain text e-mail message with a code in it. Once you receive it you can enter it on the next page, or if you have left this site, you can return to http://login.appinventor.mit.edu/login and enter it.