Depending on whether you send or receive mail in your dream the interpretations can be different. Similarly, the time in the dream in which you will send or receive mail can have in influence on the meaning.
Dreaming that you have received mail at night time signifies that you will soon enter into some bizarre and unfortunate situation. This might cause some loss of standing and reputation in your life though your income is unlikely to be affected.
Dreaming that you have received mail during daytime signifies that you will soon get out of an unfortunate situation and this will cause an increase of your reputation to a noticeable degree.
Dreaming that you have received mail in the morning signifies that the upcoming period will one which will quite stable and prosperous. Surprises are unlikely to happen in other words.
Sending mail in a dream signifies that someone will soon come to you requiring some piece of information from you. A dream of this kind that repeat itself signifies that you might be required to give some official statement in front of officers of law.
If you dream that you are delivering mail to people it means that you will be able to truly make happy some person from your close social circle.
Seeing a mailman (postman) in your dream means that you will be quite affected by petty bickery in the next few months. Try to avoid entering into more serious conflicts especially in your professional life as there is a danger of this situation bringing loss of profits.
If you dream that you have attended a post office in order to send a letter it means that you will be able to profit in the upcoming time from a piece of information that you will acquire. Sometimes this dream signifies good profits with stocks and bonds in the next few months.