jails, cron and sendmail

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Hello,

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
listen to the jails external interface), I put those lines into my
/etc/rc.conf:

sendmail_enable="NO"
sendmail_outbound_enable="NO"
sendmail_submit_enable="NO"

this works fine: nothing listening on the jails interface... except that
cron tries to deliver its status mails and fails.

While failing, sendmail seems to hog cpu and finally floods
/var/spool/clientmqueue and /var/log/maillog.

My quick fix now is to replace /usr/libexec/sendmail/sendmail with
/usr/bin/true in /etc/mail/mailer.conf, however: it seems problematic
that cron insists on a mail sub system, when all it should do is execute
stuff periodically. There should be an option to let it only log to a file.

For my jails this would make sense, too: I never read root's mails
locally, anyway.

Am I missing the obvious solution here?

erdgeist
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