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Exim Authenticated Smarthost

Today's ISP environment requires authenticated SMTP to be able to
send emails. As a policy, authenticated SMTP helps cut down on folks
sending SPAM and allows the ISP to track which account is sending what
type of email content for further demographic study. While
authenticated SMTP is good for the ISP, it is not a configuration
supported out of the box by most Linux distributions. This means that all those system emails and log reports emailed by root never make it anywhere anymore.
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