Check the Trash, Deleted Items, or Bin folder
Restore the message if it is still there
Use the email provider’s “Recover deleted messages” or “Recover from server” option
Check the Archive folder
Search for the email by sender, subject, or keywords
Restore from a backup if you have one
Contact your email provider’s support team
Check whether the account is synced with another device that may still have the message
Review retention or recovery settings for your email service
Act quickly, since deleted mail may be permanently removed after a limited time