From Citizendium, the Citizens' Compendium
- Internet : International "network of networks" that connects computers together through the Internet Protocol Suite and supports applications like Email and the World Wide Web.
- Email system : General overview of how the Internet electronic mail system works.
- Email history : History and development of electronic mail.
- Email abuse : The unsolicited sending of spam, third party advertisements, derogatory language, slander, and threats via electronic mail.
- Email user programs : Email user programs and their features.