How to Fix Google Apps “Send mail as” : “Functionality not Enabled”

  1. Login to Google Apps for Work Admin Panel.
  2. Go to “Apps” settings: Manage Apps and their settings.
  3. Select “Google Apps“: Gmail, Calendar, Drive, & more.
  4. Select “Gmail“.
  5. Scroll to the bottom and click “Advanced Settings“.
  6. Uncheck option “Allow per-user outbound gateways” and Save.
  7. Wait for 1 hour.
  8. Check (reactivate) “Allow per-user outbound gateways” option and Save.
  9. Wait for 1 hour.
  10. Try to set “Send Mail As” feature in your Google Apps Gmail Settings again.

If it’s a success you will see SMPT outgoing setting after you submit the “Send mail as” email address and no longer see “Functionality not Enabled” message.



    • David

      I just check and it’s still there. The settings is still available.
      But, if you can always ask support by email/phone.
      I did it once for other issue (by phone) and the support is okay.

  1. Phil

    “Allow per-user outbound gateways” is present in my managed domain settings.
    Waiting for 1 hour now 🙂

  2. Shaun

    I’ve been looking for this info all morning. I’ve had this issue for months and finally got tired of having it so I went Googling. 🙂

    I’ve been getting this message forrrrr-eeevvveeerrr! –
    “You must send through SMTP servers when you send as _____________. However, this functionality is not available for your account. Please contact your domain administrator for more information.”

    Now to wait the 1 hour for it to propagate.

  3. Scott

    I had the same error message when I tried to use Gmail to “Send As” with an email address hosted at GoDaddy. Here is the step-by-step that worked out for me, plus the screenshots for getting to the “Allow per-user outbound gateways” solution:

    1. Log in to the G Suite account for your domain name>
    2. Select Apps>
    3. Select G Suite>
    4. Select Settings for Gmail>
    5. Select End User Access>
    6. Scroll to find “Allow per-user outbound gateways” select it to edit>
    7. Check the box for “Allow users to send mail through an external SMTP server when configuring a “from” address hosted outside your email domain” to ON>
    8. Select “Save”


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