code: @Test public void testCommonsMailer() throws Exception {
    Mail mail=MailImplTestHelper.getMailImplWithDemoContent();
    CommonsmailHelper commonsmailHelper=new CommonsmailHelperImpl();
    Postoffice postoffice=new PostofficeCommonsmailImpl(commonsmailHelper,"localhost",SMTP_TEST_PORT,false,null,null,false);
    postoffice.send(mail);
    assertEquals("from1@domain",((InternetAddress)greenMail.getReceivedMessages()[0].getFrom()[0]).getAddress());
    assertEquals("subject",greenMail.getReceivedMessages()[0].getSubject());
  }
  