A mailing list is a collection of email addresses that get one and the same email message simultaneously. When you send an email to the mailing list address, your message will be forwarded to all the addresses on that mailing list automatically, but none of the receivers will learn who the other recipients are. In the general case, users have to sign up for a list, but occasionally mailboxes are included manually without the consent of their owners. Based on the given mailing list administration software, you may also be able to approve new mailing list subscribers, so people will not be able to join a mailing list unless you authorize their signup request. The mailing list option is rather handy if you’d like to send newsletters on a regular basis or some other sort of periodic notifications to customers, considering that you’ll need to send just a single e-mail message and all of the mailing list subscribers will get it immediately. As a result, you won’t have to enter a huge number of mailboxes manually.