noun
sender of a message
Refers to the person who sends a message, letter, email, or other communication. Often used in formal or technical contexts.
この手紙の発信人は誰ですか。
Who is the sender of this letter?
メールの発信人を確認してください。
Please check the sender of the email.
差出人 is a more common word for 'sender' of physical mail or packages, while 発信人 is often used for electronic messages or formal communications.
Compound of 発信 (transmission, sending) and 人 (person).