Letter-carrier dream meaning is explained below using 3 different sources. Each interpretation is shown with its source.

Interpretation 1 — Gustavus Hindman Miller

If you dream of a letter-carrier coming with your letters, you will soon receive news of an unwelcome and an unpleasant character.

To hear his whistle, denotes the unexpected arrival of a visitor.

If he passes without your mail, disappointment and sadness will befall you.

If you give him letters to mail, you will suffer injury through envy or jealousy.

To converse with a letter-carrier, you will implicate yourself in some scandalous proceedings.

Source: Ten Thousand Dream Interpretation Author: Gustavus Hindman Miller

Interpretation 2 — Garuda

Vision: Meeting a letter carrier on the road: someone is sending you money unexpectedly. Seeing a letter carrier: you are gaining new insight into your personality and character. This newfound self-knowledge brings new hope.
Source: Dreamers Dictionary Author: Garuda

Interpretation 3 — Ibn Seerin

(See Mailman,’ Minaret, Ostrich)
Source: Islamic Dream Interpretation Author: Ibn Seerin