A mailing list is a collection of email addresses which receive the exact same message simultaneously. When you send a message to the mailing list address, it will be forwarded to all the email addresses on that mailing list automatically, but none of the receivers will see the other recipients. In the general case, one has to register for a mailing list, but occasionally email addresses are included manually without the permission of their owners. Based on the given mailing list management software, you may also be able to include new subscribers, so people cannot register for a mailing list unless you authorize their signup request. The mailing list feature is quite valuable in case you’d like to send newsletters on a regular basis or some other type of periodic notifications to clients, as you’ll have to send just a single e-mail and all the mailing list subscribers will receive it immediately. As a result, you won’t need to fill in numerous email addresses manually.