(さしだしにん)

さしだしにん
noun
sender
1. sender
The person who sends a letter, package, or other mail item. This information is typically written on the back of an envelope or on the return address label.
Please write the sender's name.
Write the sender's information on the back of the envelope.
In Japan, the sender's address is typically written on the back of the envelope
A letter from an unknown sender arrived.

差出人(さしだしにん) refers to the sender of mail or packages.

POSTAL CONVENTIONS IN JAPAN:
In Japanese postal convention, the sender's information is written on the back ((うら)) of the envelope, while the recipient's address is on the front ((おもて)).

COMMON EXPRESSIONS:

CONTRAST: