Make validations for email model and modify view to make sure required fields are marked

Need to add validation to the email model to make sure message and title are present and modify the view to make fields such as title and view are validated.

Locate the email model and its corresponding view in the repository. Check how required fields are currently handled, then verify that message and title are validated and that the view marks the required fields. No test file or entry point is mentioned, so inspect the existing model and view tests if available.

Written by the indexing model from the issue text.