A bulletin can move between statuses depending on the action taken:
Create → Send Immediately → Sent
Create → Save as Draft → Draft → Send Immediately → Sent
Create → Save as Draft → Draft → Schedule for Later → Scheduled → Sent
Create → Schedule for Later → Scheduled → Sent
If a scheduled bulletin is unscheduled:
Scheduled → Unschedule → Draft
Once the bulletin reaches Sent status, it becomes read-only and can only be viewed.