[ubuntu] What is sending email to [email protected] (exim4)

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http://ubuntuforums.org – I'm trying to figure out the source of some failing email to root@ on an internet server. I don't know if it is anything to do with exim4, but that's the MTA. I can see the logs of the attempts with the external server in /var/spool/exim4/msglog, and what looks like a log of messages received by exim4 in /var/spool/exim4/input. [Seems odd that I can't cd to some of the directories - even with sudo] But I haven't been able to figure out the source of the emails. I've searched all the mysql databases for the string - no luck. I'm trying to search the entire disk for the string, bu (Hardware)