Disable nested IMAP messages

app/src/main/java/com/sun/mail/imap/protocol/BODYSTRUCTURE.java

@@ -271,7 +271,7 @@ public class BODYSTRUCTURE implements Item {
 		    throw new ParsingException(
 			    "BODYSTRUCTURE parse error: bad ``lines'' element");
 	    } else if (type.equalsIgnoreCase("message") &&
-		     subtype.equalsIgnoreCase("rfc822")) {
+		     subtype.equalsIgnoreCase("rfc822") && false) {
 		// Nested message
 		processedType = NESTED;
 		// The envelope comes next, but sadly Gmail handles nested