set.add(mpi.getContentTypeString());
set.add(mpi.getContentType());
	 public static Set<String> getAttachmentList(List<MPartInfo> parts) {	     // get a set of all the content types 	     HashSet<String> set = new HashSet<String>();         for (MPartInfo mpi : parts)	         if (mpi.isFilterableAttachment())	             set.add(mpi.getContentTypeString());	     return set;	 }