With a mailing list, you can send out one and the same e-mail to different recipients simultaneously. The list is a collection of their email addresses, so every time you send one single email to the mailing list address, firstname.lastname@example.org – for example, it’ll be forwarded automatically to all the mailing list subscribers straight away. Normally, people have to register for such a list, but occasionally their email addresses can be included manually as well, depending on the application that is being used to manage the list itself. You can use the feature to reach prospective or existing clients and to send them newsletters, brand new offers and other kinds of info on a regular basis. This will show your desire to keep in touch with them and will increase the reputation of your web site.