An electronic mailing list is a list of email addresses that receive one and the 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 become aware of who the rest of the recipients are. Generally, users have to sign up for a list, but occasionally mailboxes are added manually without the approval of their owners. Based on the given mailing list administration software, you may also be able to greenlight new subscribers, so users cannot register for your mailing list unless you okay their request. The mailing list option is very useful in case you wish to send newsletters on a regular basis or some other kind of periodic announcements to customers, since you’ll need to send out only one email message and all of the subscribers will receive it immediately. This way, you will not have to type in a huge number of mailboxes manually.