An electronic mailing list is a collection of email addresses that get the exact same email message simultaneously. When you send an email to the mailing list address, your message will be redirected to all the email addresses on that mailing list automatically, but none of the receivers will learn who the rest of the recipients are. Generally, one has to subscribe to a mailing list, but sometimes mailboxes are added manually without the awareness of their owners. Based on the particular list management software, you may also be able to add new subscribers, so users cannot sign up for your mailing list unless you authorize their request. The mailing list feature is extremely useful if you’d like to send regular newsletters or some other kind of periodic announcements to customers, considering that you will have to send out just a single e-mail message and all of the mailing list subscribers will get it instantaneously. This way, you won’t have to fill in numerous mailboxes manually.