Joomla! is a content management system platform for publishing content on the World Wide Web and intranets as well as a Model–view–controller (MVC) Web Application Development framework.

The system includes features such as page caching to improve performance, RSS feeds, printable versions of pages, news flashes, blogs, polls, website searching, and language internationalization.
Wikipedia

Electronic mail, often abbreviated as email or e-mail, is a method of exchanging digital messages, designed primarily for human use.
Wikipedia

Marketing is an integrated communications-based process through which individuals and communities are informed or persuaded that existing and newly-identified needs and wants may be satisfied by the products and services of others.

Marketing is used to create the customer, to keep the customer and to satisfy the customer. Wikipedia