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I noticed that one of our servers (running Ubuntu) can send mails to any domain ( , using simple "sendmail" command.

But I cannot figure out how to configure similar setup in a new server. I cannot see any files such as "/etc/mail/" in the first server.

How does this work ? Does it use some other SMTP server to do actual mail delivery? Where can I find these settings?

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It's probably running postfix, not sendmail. The sendmail command is provided mainly for cross-compatibility.

You'll find the configuration files for postfix in /etc/postfix and documentation at the Postfix homepage.

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It might be postfix...or rmail, or qmail, or nullmailer, or Exim.... – symcbean Jul 31 '12 at 9:25

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