Hi everyone, I have an Ubuntu server 10.04.4 LTS box, I want to understand more about how it sends emails, replicate on other boxes, get some goodness such as nagios alerts going out, for example. I know my knowledge in this area is quite weak.

The configuration details (related to the MTA at least) were not documented during install. It's clear from /var/log/mail.log that postfix is the MTA. I can read system emails via "mail". Output of cron jobs are being emailed successfully to an external address specified in the MAILTO= line of each crontab.

crontab MAILTO addresses set as u...@mydomain.com however will NOT arrive. I believe that somewhere I have unwisely set the box's domain to be mydomain.com since when I view system emails via "mail" they are going to r...@mydomain.com. What config file am I needing to edit to put the box in some other internal domain so it can send messages out to mydomain.com? If I am not on the right track here, could someone nudge me in an appropriate direction?

Thanks,
Roger

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