code: public static Recipient[] toRecipient(List<String> to) {
  		Recipient[] addresses = new Recipient[to.size()];
  		int i = 0;
  		for (String t : to) {
  			addresses[i++] = new Recipient(t);
  		}
  		return addresses;
  	}
docs: Converts a list of string to a list of recipients. Each recipient will
  have the type {@link RecipientType#TO}.
  
  @param to
  the list of addresses to convert (typical address syntax is of
  the form "user@host.domain" or "Personal Name
  &lt;user@host.domain&gt;")
  @return the list of recipients