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The default email server for Debian is exim. This can be set up in one of several ways, depending on how you will access your email. The exim configurator will list the options.

Generally, for a networked machine (e.g., Athens (98.2)) that is not acting as a mail server, but using a remote smarthost (SMTP server) to send email, yet still delivering email locally (which is obtained using fetchmail, for example, from an IMAP server, you will choose option 2.

The information you then supply is:

visible name	athens.togaware.com
other names	none
domain rely	none
network relay	none
smarthost	mailhost.togaware.com
root email sent to	kayon

This means that mailhost.togaware.com is used for sending email. Any email sent from Athens (98.2) to an unqualified address (i.e., no @) will have athens.togaware.com appended to it and delivered locally.