> ## Documentation Index
> Fetch the complete documentation index at: https://docs.formbox.app/llms.txt
> Use this file to discover all available pages before exploring further.

# SMTP custom email domain

> Send auto-response emails from your custom email domain using SMTP

<Tip>Custom email domains are only available on the **Professional** and **Business** plans.</Tip>

## How to enable custom email domain

Go to the form you want to enable the custom email domain for and navigate to the `Settings` tab.

<Frame>
  <img src="https://mintcdn.com/formbox/05sa9iZ1Da5XhrTY/images/form-settings.png?fit=max&auto=format&n=05sa9iZ1Da5XhrTY&q=85&s=6e020cdad13cfca8558e0c56ed1a3aa4" style={{ borderRadius: "0.5rem" }} width="2552" height="1704" data-path="images/form-settings.png" />
</Frame>

Navigate to `Email configuration` section, and enable the toggle. The `Respondent email notifications` toggle will need to be enabled as well.

<Frame>
  <img src="https://mintcdn.com/formbox/27_5fcxY_YavrIb7/images/smtp-toggle.png?fit=max&auto=format&n=27_5fcxY_YavrIb7&q=85&s=7e10e33051b757250c32372c6689f04c" style={{ borderRadius: "0.5rem" }} width="2718" height="1736" data-path="images/smtp-toggle.png" />
</Frame>

From there, you can update the SMTP settings by clicking on the `Edit configuration` button.

<Frame>
  <img src="https://mintcdn.com/formbox/27_5fcxY_YavrIb7/images/smtp-settings.png?fit=max&auto=format&n=27_5fcxY_YavrIb7&q=85&s=240a2c4e98b17f54865e427268163d64" style={{ borderRadius: "0.5rem" }} width="2718" height="1736" data-path="images/smtp-settings.png" />
</Frame>

Done, now every time a customer submits a message to your form, they will get an auto response email notification from your custom email domain.