Make sendmail listen on the loopback interface only
It is almost always necessary to run the sendmail daemon, even on systems that don’t act as public SMTP servers. Without sendmail, output from cron and at jobs won’t be delivered. However, unnecessarily exposing your SMTP ports to the Internet or even to a large LAN is poor security practice. This article will explain how to configure sendmail to listen only on the local loopback interface (127.0.0.1) in Slackware.
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