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    Of course, that can be done with PHP. Commented Aug 17, 2010 at 3:56
  • So what if I used the mail() function and it returned false? Commented Aug 17, 2010 at 3:56
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    All that means is the PHP function failed. That says very little about whether the email address actually exists. Commented Aug 17, 2010 at 3:59
  • @Albino That still doesn't tell you anything Commented Aug 17, 2010 at 3:59
  • It is blatantly false that you can not validate an email. There are some RFC validation libraries available that will validate any internet-routable email address as well-formed. They won't validate local addresses or local domains properly. However, it is very true that sending an email to the address in question is the best way to ensure it's legit. Commented Aug 17, 2010 at 4:06