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Solving Gmail SMTP “Functionality not enabled” error

The following will help you if you are attempting to set up an email alias from an external domain in your Gmail but you encounter the following error:

Functionality not enabled.
You must send through yourdomain.ca SMTP servers when you send as info@yourdomain.ca. However, this functionality is not available for your account. Please contact your domain administrator for more information.

What is causing this is that your Google G-Suite or Google Workspace account does not allow per-user outbound gateways. According to Google, this setting would allow users to send mail through an external SMTP server when configuring a “from” address hosted outside your email domain.

This setting for your account is likely turned off, so follow these steps to enable it:

  1. Click here to navigate to your End User Access settings.
    1. If the link doesn’t get you to the correct page, here are the steps to navigate there manually:
      1. Google Admin > Apps > Google Workspace or G-Suite > Gmail > End User Access
  2. Hover over the Allow per-user outbound gateways option and click the edit icon (pencil)
  3. Check the box labelled “Allow users to send mail through an external SMTP server when configuring a “from” address hosted outside your email domain” then click Save
  4. In our testing, the change can take up to an hour to apply to your account