Helper Interfaces, Classes and Traits AbstractHelper Base class for message helpers. GenericHelper Provides common Message helper routines for Message manipulation. MessageHelperService Responsible for creating helper singletons. MultipartHelper Provides various routines to manipulate and create multipart messages from an existing message (e.g. to make space for attachments in a message, or to change a simple message to a multipart/alternative one, etc...) PrivacyHelper Provides routines to set or retrieve the signature part of a signed message.