Be careful. That kind of thing can be abused very easily, and next thing you know, email you send to people will end up in their junk/bulk mail folders, and you’re blacklisted as a spammer. Any type of automatic emailing is actually a highly complex issue, with (1) anti-spam techniques like limiting the number of emails per user, and using a captcha algorithm, (2) storing outbound messages in a database and not sending them all right away, but rather putting them in a queue and sending them out at intervals, so as not to exceed the outbound email limit of your web host (see the fine print in your contract for the actual limit). (3) You’ll also have to keep tabs on the total number of messages sent to each DOMAIN…. you might be under your limit but still get tagged as a spammer if all those messages went out to the SAME domain (AOL is known to do this, for example).