implemented retaining of messages from non-members

src/main/java/de/srsoftware/widerhall/mail/SmtpClient.java

@@ -92,6 +92,7 @@ public class SmtpClient {
     }
 
     public void send(String senderAdress, String senderName, String receivers, String subject, String content) throws MessagingException, UnsupportedEncodingException {
+        login();
         MimeMessage message = new MimeMessage(session);
         message.addHeader("Content-Type","text/plain; charset="+UTF8);
         message.addHeader("format","flowed");