Added some known content sub types

app/src/main/java/eu/faircode/email/MessageHelper.java

@@ -4275,9 +4275,11 @@ public class MessageHelper {
                         !("mixed".equalsIgnoreCase(ct.getSubType()) ||
                                 "alternative".equalsIgnoreCase(ct.getSubType()) ||
                                 "related".equalsIgnoreCase(ct.getSubType()) ||
-                                "report".equalsIgnoreCase(ct.getSubType()))) {
+                                "report".equalsIgnoreCase(ct.getSubType()) ||
+                                "parallel".equalsIgnoreCase(ct.getSubType()) ||
+                                "digest".equalsIgnoreCase(ct.getSubType()) ||
+                                "appledouble".equalsIgnoreCase(ct.getSubType())))
                     Log.e(part.getContentType());
-                }
             } catch (Throwable ex) {
                 Log.e(ex);
             }