# Sandbox Domain

Once your account has been activated by the Support Team, the system automatically assigns a sandbox domain to your account. You will find it in the Domain Authorization tab. This solution enables immediate technical verification of connections and production sends from the panel or via API, with no prior DNS configuration required.

To send your first message, you must generate a sender address (From) assigned to this domain.

### Instructions for creating a sender address for the sandbox domain

1. Go to the **E-mail addresses authorization** tab and click the **+ New sender's address** button.
2. In the window that appears, enter your preferred address prefix (the text before the @ sign).
3. From the dropdown list on the right, select the name of your sandbox domain.
4. Fill in the **From name** field (this will be visible to message recipients).
5. Confirm the changes by clicking **Save**.

<figure><img src="/files/E2TB8QLHbg4JaHZHA0L1" alt=""><figcaption></figcaption></figure>

Once you complete these steps, the new address will appear in the campaign wizard and will be ready to use in API or SMTP integrations.

### Limitations and terms of use for the sandbox domain

Using the sandbox domain comes with certain operational conditions:

* The domain is intended solely for testing your connection and sends with MessageFlow and does not guarantee high message deliverability.
* DNS settings and records within the sandbox domain are locked and cannot be edited.
* When you upgrade to any paid plan, the sandbox domain is permanently removed. This also results in the deletion of all associated sender addresses and the disconnection of any campaigns that used them.
* Before switching to a paid plan, we recommend completing full authorization of your own domain to build an independent sender reputation and ensure sending continuity.

To activate a paid plan and transition to your own sending infrastructure, [contact our sales team](mailto:sales@messageflow.com) directly.


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