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As mentioned earlier, the installed Ubuntu system is only set up to handle e-mail local to the system, not for sending mail to others nor for receiving mail from others.
If you would like exim4 to handle external e-mail, please refer to the next subsection for the basic available configuration options. Make sure to test that mail can be sent and received correctly.
If you intend to use a graphical mail program and use a mail server of your Internet Service Provider (ISP) or your company, there is not really any need to configure exim4 for handling external e-mail. Just configure your favorite graphical mail program to use the correct servers to send and receive e-mail (how is outside the scope of this manual).
However, in that case you may need to configure individual utilities to correctly send e-mails. One such utility is reportbug, a program that facilitates submitting bug reports against Ubuntu packages. By default it expects to be able to use exim4 to submit bug reports.
To correctly set up reportbug to use an external mail server, please run the command reportbug
--configure and answer “no” to the question if an MTA is available. You will then be asked for the SMTP server to be used for submitting bug reports.