Two-Tier E-mail Architecture
User agents (also called e-mail clients)
- Run on client computers
- Send e-mail to e-mail servers
- Download e-mail from mailboxes on those servers
- Examples: Eudora, Outlook, Netscape Messenger
Mail transfer agents (also called mail server)
- Used by e-mail servers
- Send e-mail between e-mail servers
- Maintain individual mailboxes.