noun
bulk mailing; mass mailing
Refers to sending a large volume of mail, email, or messages at once, often in business or marketing contexts.
大量送信の準備に時間がかかった。
Preparing the bulk mailing took time.
このソフトは大量送信に便利です。
This software is convenient for mass mailing.
Compound of 大量 (large quantity) and 送信 (transmission, sending).