Source: The Great Interpretation of Dreams (Ibn Sirin)
A mailman in a dream indicates news coming from afar. If his face is handsome, it is good news. If it is ugly, it is bad news.
Source: Perfuming Humanity in the Expression of Dreams (Al-Nabulsi)
Mail indicates a trustworthy man who delivers news. Seeing him indicates the fulfillment of needs.
Source: Signs in the Science of Expressions (Ibn Shaheen)
Mail is interpreted as news. Whoever sees himself receiving mail will hear news.