E-mail
Many proprietary E-mail systems can forward E-mail from hosts that are not connected to the Internet
Among the advantages of Internet E-mail are:
- A uniform E-mail service
- Higher reliability than with gateways
End-to-end E-mail delivery guarantees that each message remains at the sending host until it is successfully copied to the receiving host
E-mail gateways often cause problems in practice
The ITU-T X.400 Message Handling System (MHS) is almost dead and is largely ignored in this presentation