noun
automated response; autoreply
Commonly used for email auto-replies, out-of-office messages, and automated system responses.
休暇中は自動返信メールを設定した。
I set up an automated reply email during my vacation.
問い合わせフォームから自動返信が届いた。
I received an automated response from the inquiry form.
自動応答 is broader, covering any automatic answering (e.g., phone systems), while 自動返信 specifically refers to sending a reply message.
Compound of 自動 (automatic) and 返信 (reply/response).