In case your Sophos UTM cannot send emails directly, you can configure a smarthost to send the emails. Proceed as follows:

  1. Enable External SMTP server status on the Management > Notifications > Advanced tab.

    Click the toggle switch.

    The toggle switch turns amber and the External SMTP Server area becomes editable.

  2. Enter your smarthost.

    You can use drag-and-drop. The port is preset to the default SMTP port 25.

  3. Specify the authentication settings.

    If the smarthost requires authentication, check the Authentication checkbox and enter the corresponding username and password.

  4. Click Apply.

    Your settings will be saved.

    The switch turns green.