Routing all mail to unknown users to a single mail account

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Recently one of our clients mail server was getting lots email message from unknown users which was causing some trouble so I decided to route all mail to unknown users (for verification ) to a single mail account. This server use sendmail MTA. Sendmail has option called LUSER_RELAY.

Open Sendmail configuration file using text editor:

# vi /etc/mail/

Add following macro to file:



# m4 /etc/mail/ > /etc/mail/

Reload configuration:

# /etc/init.d/sendmail restart

Please note that you can also configure virtual domains but it will take some time to configure sendmail virtual domains.

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Posted by: Vivek Gite

The author is the creator of nixCraft and a seasoned sysadmin, DevOps engineer, and a trainer for the Linux operating system/Unix shell scripting. Get the latest tutorials on SysAdmin, Linux/Unix and open source topics via RSS/XML feed or weekly email newsletter.