The MailMessage class keeps track of a single mail message with one or multiple bodies and attachments and header information.
| TEXT | Message part type |
| MULTIPART | Message part type |
| MESSAGE | Message part type |
| APPLICATION | Message part type |
| AUDIO | Message part type |
| IMAGE | Message part type |
| VIDEO | Message part type |
| OTHER | Message part type |
See Mailer for code examples.