refs https://github.com/TryGhost/Team/issues/947
- During the work of the UI and moving `email_only` flag to publish menu it created the situation where the publishing of the post was at the same time as adding `email_only` flag, resulted in not picking up teh `sent` status as the `posts_meta` model and record were's available during save.
- Adding the incoming attribute check for email_only flag covers this situation
refs https://github.com/TryGhost/Team/issues/953
- We need to track email-only posts that have been sent out. New status was chosen as a way to differenciate such posts.
- Introducing a new "email post" type, conceptually like "page", was considered. Because there is no clear roadmap for "email post" becoming a bigger part of the product yet and a lot of uncertainty around this concept, overhead needed to introduce a new type was just too much to do at this moment. It's still a possibility in the future
refs https://github.com/TryGhost/Team/issues/948
- The frontend route `/email/:uuid` is aliased to the preview as a temporary solution. It fulfills the premise of the email-only post anyway - not being accessible publicly and only shared through email.
- The tests for the new route are missing as adding them was way more problematic than I envisoned. They are in the works and will be added as a follow up commit next.
refs https://github.com/TryGhost/Team/issues/949
- When post is marked as "email-only" we can send it out to the selected audience when publishing without making the post publicly available
- The feature is available for experimentation behind "email only" alpha flag available in labs
