# Extensions

User Extensions allow you to create unique, disposable variations of your email address by adding a suffix to your username. These are perfect for tracking who is selling your data, organizing sign-ups, or creating temporary contact points without revealing your primary address.

Extensions use the format: user-extension@domain.com.

### Add a static extension

A static extension creates one specific address. For example, if your username is *kim*, creating an extension called *shopping* results in *kim-shopping@domain.com*.

- **Log in to your [User Panel](https://cp.emailarray.com/).** Use your full email address and password to sign in.
- Click the Extensions icon.
- Click the **Add Extension** button.
- Name your extension: Enter a word (e.g., *sales*).
- Set the destination: Enter the email address where messages should be delivered (usually your full email address).
- Click **Add Extension**.

### Add a dynamic (wildcard) extension

Dynamic extensions act as a "catch-all" for any variation following your keyword. If you create a wildcard extension named project, it will accept mail sent to *user-project-anything@domain.com*.

- **Log in to your [User Panel](https://cp.emailarray.com/).** Use your full email address and password to sign in.
- Click the Extensions icon.
- Click the **Add Extension** button.
- Name your extension: Enter **your keyword** followed by **-default** (e.g., **sales-default**).
- Set the destination: Enter your email address in the **Deliver** to field (usually your full email address).
- Click **Add Extension**.

Example: This will now accept mail for *user-sales-john@domain.com*, *user-sales-amy@domain.com*, and any other variation starting with *user-sales-*.

### Remove an extension

- **Log in to your [User Panel](https://cp.emailarray.com/).** Use your full email address and password to sign in.
- Click the **Extensions** icon.
- Click on the remove icon next to the extension you want to remove