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