A mailing list is a list of email addresses that get the very same email simultaneously. When you send a message to the mailing list address, it will be re-sent to all the email addresses on that mailing list automatically, but none of the receivers will learn who the other recipients are. Generally, users have to register for a mailing list, but sometimes email addresses are included manually without their owners’ approval. Depending on the given list administration software, you may also be able to greenlight new mailing list subscribers, so users will not be able to subscribe to your mailing list unless you okay their request. The mailing list feature is rather handy in case you’d like to send regular newsletters or some other type of periodic announcements to customers, as you will need to send out only one single e-mail message and all the subscribers will receive it immediately. This way, you will not need to type in a lot of email addresses manually.