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From: David King <dking@ketralnis.com>
Date: Sat, 26 Aug 2006 22:30:52 -0700
To: freebsd-hackers@freebsd.org
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Subject: Re: jails, cron and sendmail
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>> I have the following problem: since I need and do not like any  
>> kind of
>> smtp activity in my jails (there's no 127.0.0.1 in a jail, all  
>> services
> [...]
>> cron tries to deliver its status mails and fails.
> try 'MAILTO=""' in /etc/crontab

That will work for any custom Cron just that you've set, but it won't  
work for the default periodic jobs, since periodic(1) handles its own  
mailing