noun
alternate recipient assignment
Computing term for designating another person to receive messages or notifications in one's place, often used in email or groupware settings.
メールシステムで代行受信者登録を設定すると、不在時に別の人がメールを受け取れます。
By setting up alternate recipient assignment in the mail system, another person can receive your emails while you are away.
Compound of 代行 (proxy, acting on behalf of), 受信者 (recipient), and 登録 (registration). The exact derivation is uncertain; it is a technical term likely coined in computing contexts.