An electronic mailing list is a list of email addresses which 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 addresses on that mailing list automatically, but none of the receivers will see the other recipients. In the general case, people have to join a mailing list, but sometimes mailboxes are included manually without the awareness of their owners. Depending on the particular list administration software, you may also be able to add new mailing list subscribers, so people cannot subscribe to your mailing list unless you authorize their request. The mailing list option is quite valuable if you’d like to send regular newsletters or some other type of regular notifications to customers, considering that you will have to send one single email and all of the mailing list subscribers will receive it immediately. As a result, you won’t need to fill in a lot of email addresses manually.