Don't worry; messages cannot be deleted from the mail for no reason.

We'll explain the cases where messages can be deleted from your account without you deleting them:
- When the number of messages and reports reaches 999, all old messages with a history exceeding three months are deleted except for messages added to favorites.
- If you deleted and reinstalled the game and have important messages, reports, or even references that you want to keep, take a screenshot and save it to your device.
- If you open your Base from another device, you may lose some messages and battle reports.
- Relocating between servers during cross-server events will delete all messages from your inbox, and a warning message will appear before proceeding with this action.