An electronic mailing list is a list of email addresses which receive the exact same email message simultaneously. When you send a message to the mailing list address, it will be redirected to all the addresses on that mailing list automatically, but none of the receivers will see the other recipients. Generally, people have to subscribe to a mailing list, but occasionally email addresses are added manually without the awareness of their owners. Depending on the concrete list management software, you may also be able to include new mailing list subscribers, so people will not be able to join a mailing list unless you okay their request. The mailing list feature is extremely handy in case you wish to send newsletters on a regular basis or some other sort of periodic publications to customers, since you’ll have to send only one e-mail and all the subscribers will receive it immediately. As a consequence, you won’t need to insert a lot of email addresses manually.