The CRUD matrix
| User | Messages | Drafts | File | |
| Create a message | C | C | ||
| Send a message |
R | CR | ||
| Add new recipients to messages |
U | RU | ||
| Attach files to messages |
CU | RU | R | |
| Delete drafts |
D | D | ||
| Save drafts |
CU | CU | ||
| View recipients addresses |
R | R | ||
| View sended messages |
R | R | ||
| View groups of recipients |
R | R | ||
| View all my drafts | R | R |