From owner-freebsd-questions@FreeBSD.ORG  Fri Jul  1 19:23:38 2005
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Date: Fri, 1 Jul 2005 15:23:37 -0400 (EDT)
From: Francisco Reyes <lists@natserv.com>
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Subject: Fixed (Cron fails. Error in /var/log/maillog: No recipient) 
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On Wed, 29 Jun 2005, Francisco Reyes wrote:

For the archives.

Problem was crontab failing.
first thing I noticed was

> postfix/sendmail[36590]: fatal:
> No recipient addresses found in message
> header

In /var/log/maillog

Then someone suggested to look at /var/log/cron
There I saw errors like

NSSWITCH(nss_method_lookup): nis, passwd_compat, endpwent, not found

Some digging and found that if one takes off NIS from the system one needs 
to change /etc/nsswitch.conf to
group: files
hosts: files dns
networks: files
passwd: files
shells: files

That solved the problem.
However, I find it very interesting that cron fails if it can not send out 
an email.