markdown\_contentname: markdown | content: An e-mail is a message sent from one computer or mobile phone to another over the Internet. Today, its usefulness in the world is well established. A recent study indicates that there are approximately 4.15 billion email users worldwide. It is the most personal space you have on the internet and you can access it from anywhere in the world thanks to the internet. Generally, an email is composed of the content of the message and a header.