E-mail
The first killer application of the Internet
Global E-mail addresses of the type: “local_name”@”domain-name”
- “local name” usually is the name (alias) or username of a person
- “domain-name” defines the mail exchanger, which normally is the host where the mail is to be sent
- For example: < Presidentti@tpk.fi> is the E-mail address of the President of Finland
E-mail can often be sent through which ever SMTP server (increasingly often the servers don’t allow relaying)
Receiving E-mail requires a user account on some host that is always on (the mail exchanger)
A common arrangement is a free client program (such as the Qualcom Eudora) on a PC and an account on some Unix host that is always on and permanently connected to the Internet