Mailing Lists let you collect a group of subscribers who are all reachable under a single E-mail address.
That means after you set up a Mailing List address and add members to the list. Anytime an E-mail is sent to the Mailing List address, the entire group of members will get that E-mail. You can import existing contacts to your Mailing List using a CSV file. Also, depending on the settings, all or just specific members can write to the list, thereby informing the entire group at once.
This feature is useful for anyone wanting to communicate with a large group.
You can create up to 5 mailing lists in your 1&1 Mailing List.