dual addresses are not enforced.  If <code>strict</code> is
 true, many (but not all) of the RFC822 syntax rules are enforced. <p>

 To better support the range of "invalid" addresses seen in real
 messages, this method enforces fewer syntax rules than the
 <code>parse</code> method when the strict flag is false
 and enforces more rules when the strict flag is true.  If the
 strict flag is false and the parse is successful in separating out an
 email address or addresses, the syntax of the addresses themsel