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 sendmail.mc using text editor:
# vi /etc/mail/sendmail.mc
Add following macro to file:
define(`LUSER_RELAY',`local:username@myhost.com')dnl
Rebuild sendmail.cf:
# m4 /etc/mail/sendmail.mc > /etc/mail/sendmail.cf
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.
See also:
- Configure sendmail as a smart host
- Force sendmail to route mail to specific hosts or mailserver
- See the list of sendmail domain-dependent macros
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