# Email Format Attribute

The [**Email Format Attribute**](/api/finder#email-format) provides insights into the most commonly used email address patterns within a company or domain. This helps predict how email addresses are typically structured across the organization.

---

## Summary

| Field        | Type   | Description                                                |
| ------------ | ------ | ---------------------------------------------------------- |
| `format`     | string | The detected email pattern used by the company             |
| `percentage` | int    | The estimated percentage of people using this email format |

---

### Example Response

```json
{
  "data": [
    {
      "format": "{l}.{first}",
      "percentage": 66
    },
    {
      "format": "{f}{l}",
      "percentage": 34
    }
  ]
}
```

---

### Format Legend

| Symbol          | Meaning                                               |
| --------------- | ----------------------------------------------------- |
| `{first}`       | First name (e.g. `john`)                              |
| `{f}`           | First letter of the first name (e.g. `j`)             |
| `{last}`        | Last name (e.g. `doe`)                                |
| `{l}`           | First letter of the last name (e.g. `d`)              |
| `{first}{last}` | Concatenation of first and last name (e.g. `johndoe`) |

For a full list of supported patterns, refer to:
[List of Patterns in Tomba Domain Search](https://help.tomba.io/en/articles/10087027-list-of-pattern-you-will-find-on-tomba-domain-search)

---

### Use Case

Use this attribute to:

- Predict professional email addresses for outreach
- Power bulk email guessers based on common patterns
- Increase success rate when using unknown email formats