Lot of iPhone users faced this problem. Email message with large attachments stuck in Microsoft outlook app for iPhone. iPhone users reported, this message also crushing iPhone battery life.
- First enable iPhone Airplane mode (Swipe up from the bottom of iPhone Home screen to open control center. Then tap Airplane mode).
- Launch Mail app.
- Navigate to the Outbox.
- Tap Edit, click the circle next to the stuck message to choose it.
- Tap Delete.
- Now disable iPhone Airplane mode.
- Finally return to the iOS Mail app.
If you knew any other solutions to fix “Email stuck in Outbox iPhone” issue, inform us via comment.