The Sealed Letter
Scholars have said that whoever sees themselves sending a sealed letter to someone who then returns it might indicate defeat if the dreamer is a ruler or a merchant, or failure to marry if they are proposing.
Per Ibn Sirin's Muntakhab al-Kalam fi Tafsir al-Ahlam
Note: These are traditional scholarly interpretations (ijtihad) drawn from a specific classical source — not a binding religious ruling, fortune-telling, or a prediction of the future.