A mailing list is a collection of email addresses that receive the exact same message simultaneously. When you send an email message to the mailing list address, your message will be forwarded to all the email addresses on that mailing list automatically, but none of the receivers will become aware of who the other recipients are. Generally, one has to register for a list, but sometimes email addresses are added manually without their owners’ awareness. Depending on the particular list management software, you may also be able to approve new mailing list subscribers, so people will not be able to join your mailing list unless you authorize their signup request. The mailing list option is extremely valuable if you wish to send newsletters on a regular basis or some other kind of regular notifications to customers, as you’ll need to send out one single e-mail message and all of the mailing list subscribers will receive it instantly. This way, you won’t have to type in numerous email addresses manually.