FIX Aviod mail duplicates

* The mails are created in `outbox` folder by default. This causes duplicates
  in some cases when they are sended througt the wizard
* We put the mails in `draft` folder and when they are redered, they are moved
  to outbox folder
Merge pull request #2 from gisce/FIX_mail_duplicates

FIX Aviod mail duplicates