E-mail Standards
SMTP - Simple Mail Transfer Protocol
- Main e-mail standard for
- Originating user agent and the mail transfer agent
- Between mail transfer agents
- Originally written to handle only text files
- Usually used in two-tier client-server architectures
Post Office Protocol (POP) and Internet Mail Access Protocol (IMAP)
- Main protocols used between the receiver user agent and mail transfer agent
- Main difference: with IMAP, messages can be left at the server after downloading them to the client
Other competing standards
- Common Messaging Calls (CMC), X.400