If you wish to deliver offers and promotions to your customers, run a newsletter, or
inform visitors of your site of recent updates, you should set up a mailing list on
your site and subscribe your users to it or invite them to subscribe themselves.
Mailing list is a convenient way to reach a number of readers at once: it contains a
list of subscribers‘ e-mail addresses, which are combined under a single e-mail
address, to which you post your information or a newsletter. Mailing lists are
provided by the GNU Mailman software, which may or may not be installed on your
server. To make sure that you can use mailing lists, contact your provider or look it
up in the control panel: go to Home > Mail, click the Mailing lists tab, and see if
there is an Add New Mailing list icon displayed in color.