Naudoju toki email tikrinimo buda:

if (eregi ('^[[:alnum:]][a-z0-9_\.\-]*@[a-z0-9\.\-]+\.[a-z]{2,4}$', 
stripslashes(trim($_POST['email'])))) {
  $e = escape_data($_POST['email']);
 } else {
  $e = FALSE;
  echo '<p><font color="red" size="+1">Please enter a valid email 
address!</font></p>';
 }

Viename serve veikia viskas ok, o irasius i kita meta klaida: Function 
eregi() is deprecated
 Kame cia gali buti beda?