A mailing list is a list of email addresses that get the exact same email simultaneously. When you send a message to the mailing list address, your message will be redirected to all the addresses on that mailing list automatically, but none of the receivers will know who the rest of the recipients are. Generally, users have to join a mailing list, but occasionally email addresses are included manually without the permission of their owners. Depending on the specific mailing list management software, you may also be able to greenlight new subscribers, so users will not be able to subscribe to a mailing list unless you authorize their request. The mailing list functionality is very handy in case you’d like to send regular newsletters or some other sort of periodic announcements to clients, considering that you will need to send only one email and all of the mailing list subscribers will get it instantly. As a result, you will not have to fill in a lot of mailboxes manually.