| Accessed from | Sender's address | Recipient's address | Method |
|---|---|---|---|
| Internal network | internal | internal | direct transfer |
| Internal network | internal | external | direct transfer |
| Internal network | internal | internal and external mixed | direct transfer |
| Internal network | external | internal | forbidden |
| Internal network | external | external | forbidden |
| Internal network | external | internal and external mixed | forbidden |
| Internet | internal | internal | The sender receives an upload link. |
| Internet | internal | external | The sender receives an upload link. |
| Internet | internal | internal and external mixed | The sender receives an upload link. |
| Internet | external | internal | Get confirmation from first internal recipient OK → The sender receives an upload link. * |
| Internet | external | external | forbidden |
| Internet | external | internal and external mixed | Get confirmation from first internal recipient OK → The sender receives an upload link. |