[Cookbook] New cookbok: How to use the Cloud to send Emails

| Q             | A
| ------------- | ---
| Doc fix?      | no
| New docs?     | yes 
| Applies to    | all
| Fixed tickets | -

This is a new cookbook article as proposed in #3193, I hope you like it.

Please let me know if there's something I can improve, especially regarding my English ;-)