Comment 11 for bug 148459

I also have this problem an can repeat it though.
I have set up samba the same way and also have the same values for the hosts: entry in /etc/nsswitch.conf

My syslog now shows the following:
Aug 5 13:39:44 gate nss_wins[3485]: awakened at Wed Aug 5 13:39:44 2009
Aug 5 13:44:47 gate nss_wins[3485]: 1 message for [...] at [...] (1861 octets).
Aug 5 13:44:48 gate nss_wins[3485]: reading message [...]:1 of 1 (1861 octets) flushed
Aug 5 13:39:45 gate nss_wins[3485]: sleeping at Wed Aug 5 13:39:45 2009 for 150 seconds

the process name fetchmail is replaced by nss_wins, resulting in the fact that the logcheck fetchmail rules do no longer filter out these messages from the logcheck generated mails.

If you need more information, don't hesitate to ask.