What is the purpose of email whitelisting in sandboxes?

The purpose of email whitelisting in sandboxes is primarily to prevent sending accidental emails. When a sandbox environment is used for testing purposes, it is crucial to control what can be sent out to avoid unintentional communication that could lead to data leaks, breaches of privacy, or other unintended consequences. By whitelisting specific email addresses or domains, the system ensures that only approved recipients can receive messages, effectively preventing any accidental transmissions that might occur during testing. This provides a controlled environment where developers can test functionality without risking external exposure.

While the other options involve aspects of email management, they do not specifically align with the unique context of using a sandbox—where the focus is on limiting and controlling communication to ensure safety and security during testing.