post https://api.rainex.io/projects//sender-emails/
Create a new sender email
Error codes:
| SMTPNotAdded | You cannot create sender emails because you have not configured SMTP server yet |
| AlreadyExists | A sender email with this email address already exists for this language |
| ServiceEmail | You have tried to create a sender email with address "[email protected]" which is forbidden |
| InvalidModelState | See the "description" field of the response for details |