Get a special cover for the letter box. If there is any open space between windows and doors, close it; similarly, if there is open space between the frame of windows and the outer opening, close that too. हॉल को ज़्यादा गर्म रखने के लिए फ़्रन्ट डोर पर भारी पर्दा लटका दें।
परिभाषा
a private box for delivery of mail पर्याय: mailbox,
public box for deposit of mail पर्याय: postbox, mailbox,
मोबाइल