| Class | MailBoxError | Indicates that some went wrong while interacting with the mail box. |
| Interface | IMailBox | No interface docstring; 4/4 methods documented |
| Class | TestMailBox | Mail box used for testing. |
| Class | POP3MailBox | Mail box which talks to a POP3 server. |
| Class | DirectoryMailBox | Mail box which reads files from a directory. |