| Class | TestMutt | Undocumented |
| Class | TestThunderbird | Undocumented |
| Class | TestEmacsMail | Undocumented |
| Class | TestXDGEmail | Undocumented |
| Class | TestEvolution | Undocumented |
| Class | TestKMail | Undocumented |
| Class | TestClaws | Undocumented |
| Class | TestEditor | No class docstring; 1/1 methods documented |
| Class | DummyMailClient | Undocumented |
| Class | DefaultMailDummyClient | Undocumented |
| Class | TestDefaultMail | Undocumented |