Add Gmail account to Google Apps account

Question

I want to send as user@gmail.com in my user@mydomain.com Google Apps for Business account.

Whenever I try to Add another email address you own under accounts in my Google Apps account, I get the following error:

You must send through gmail.com SMTP servers when you send as user@gmail.com. However, this functionality is not available for your account. Please contact your domain administrator for more information.

I have Super Admin access to the Google Apps (I'm the only user) and I already set Outgoing SMTP Server in the Advanced Gmail Settings but it still doesn't work.

Answer 1

Make sure the Allow per-user outbound gateways option is selected. You can find it in your Google Apps Control Panel (admin.google.com) → Google Apps → Gmail → Advanced Settings → "End User Access" section.

Answer 2

Ensure you're on a paid version of Google Apps. A little advertised piece of information is that it’s not available in the legacy free version.

Although the correct answer is to select "Allow per-user outbound gateways" in Apps → Google Apps → Settings for Gmail → Advanced settings, this only works in the paid version. To confuse things further, the option is available for legacy unpaid versions (but does not work).

See documentation here.

This feature is not available in the legacy free edition of Google Apps.

Hopes this helps.