| WriteMime::CompositeEntity | Used to represent MIME entities with a composite media type, which will typically have multiple body parts |
| WriteMime::CompositeMessage | A composite message is a composite entity plus email-specific headers |
| WriteMime::DiscreteEntity | A DiscreteEntity represents a MIME entity with a discrete media type, it can be used either as the base for a simple message or as a part of a CompositeEntity |
| WriteMime::Entity | Virtual base class for Mime entities |
| WriteMime::Message | Pure virtual base class for email messages |
| WriteMime::SimpleMessage | A simple email message is a discrete MIME entity plus email-specific headers |
1.5.7.1