A mailing list is a list of email addresses which get one and the same email simultaneously. When you send an email message to the mailing list address, your message will be re-sent to all the addresses on that mailing list automatically, but none of the receivers will become aware of who the other recipients are. In the general case, users have to subscribe to a list, but sometimes email addresses are included manually without their owners’ approval. Depending on the specific list administration software, you may also be able to approve new subscribers, so people cannot sign up for your mailing list unless you okay their request. The mailing list option is quite valuable in case you wish to send newsletters on a regular basis or some other kind of regular publications to clients, considering that you’ll need to send only one single e-mail and all the mailing list subscribers will get it instantly. As a consequence, you won’t have to type in multiple mailboxes manually.