All e-mails, previously deleted from the existing folders, are stored in the Trash folder. To recover a deleted e-mail:

• Go to Trash folder (tap your username in the left upper corner, then find Trash folder);

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• Choose e-mail;
• Tap on the icon on the down left corner of the screen and tap restore.

OR:

• Tap Edit in the upper right corner;
• Choose one or more letter, then tap Restore in the right down corner.