Cron Daemon error emails each day

[RJones]

Hi there.

Bit of background info:

Running zimbra (ZCS 4.5.5) on an ubuntu server.



For a while now I have been getting emails in my inbox every morning from cron daemon and also logwatch.

I usually get a 4-6mb email from logwatch containing loads of text(cant open this as every time I click the email it crashes zimbra.

After that I get an email from the cron daemon with the following information:

#######################################

/etc/cron.daily/0logwatch:

postdrop: warning: uid=0: ignoring attribute record: rewrite_context=local
/etc/cron.daily/yum.cron:

Error: Missing Dependency: httpd = 2.2.2-1.2 is needed by package httpd-devel

#######################################

Followed by another email from cron daemon with this info:

#######################################
ERROR: Please edit the example config file /etc/freshclam.conf.
ERROR: Can't parse the config file /etc/clamd.conf
#######################################

Finally followed by the last email from mail delivery system containing:
#######################################

This is the Postfix program at host localhost.ourhost.co.uk.

I'm sorry to have to inform you that your message could not
be delivered to one or more recipients. It's attached below.

For further assistance, please send mail to

If you do so, please include this problem report. You can
delete your own text from the attached returned message.

The Postfix program

: unknown user: "webmaster"

######################################

Anyone got any ideas as to what this could be, or how to best investigate the problem?

On a side note, I cant really take the server down as its running 24/7.

Thanks for the help.