@Test
    public void testDetectLotusNotesEml() throws Exception {
        // Lotus .eml files aren't guaranteed to have any of the magic 
        // matches as the first line, but should have X-Notes-Item and Message-ID
        assertTypeByData("testLotusEml.eml", "message/rfc822");
    }
EPub uses a similar mimetype entry to OpenDocument for storing
the mimetype within the parent zip file
tika-parsers/tika-parsers-standard/tika-parsers-standard-package/src/test/java/org/apache/tika/detect/TestContainerAwareDetector.java