[PHP] Verifying E-mail Addresses

[Dan Anderson]

I'm having a problem with e-mail addresses entered by users that are
invalid (i.e. $email == "some person at somewhere.com").  Is there a
function I could call like:

<?php

  if (email_is_valid($email))
   { mail_out_newsletter($email); }
  else
   { yelp_and_whine(); }

?>

Thanks in advance,

Dan

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