A mailing list is a list of email addresses that receive the very same message simultaneously. When you send an e-mail message to the mailing list address, your message will be redirected to all the addresses on that list automatically, but none of the receivers will become aware of who the rest of the recipients are. In the general case, people have to sign up for a list, but sometimes mailboxes are included manually without their owners’ permission. Based on the specific list administration software, you may also be able to greenlight new mailing list subscribers, so users will not be able to join a mailing list unless you okay their request. The mailing list feature is rather valuable in case you want to send regular newsletters or some other kind of regular notifications to customers, since you’ll have to send a single email and all of the mailing list subscribers will get it instantly. This way, you will not need to insert many mailboxes manually.