I'm trying to configure gmail for sending messages as an email address configured with your server but I get the following error message:

When you send emails with the mymail@mydomain account, you have to use llocs.net SMTP servers. However, your account does not have this feature. Consult your domain administrator.

However if I understand well your service support such technology. Do I need to configure something else on "your side" first?

Thanks in advance, regards

pablo