CentOS - May 2010 - Control what messages go into /var/spool/mail/root

Hi,

I found some info messages below in /var/spool/mail/root.
To reduce the size of that file, I'm wondering if there's a way to
prevent those unimportant messages from entering /var/spool/mail/root. Thanks.

2010-05-10T10:32:27-05:00 <authpriv.info> se1 su: pam_unix(su-l:session):
session closed for user root
2010-05-10T10:01:28-05:00 <local1.info> se1 Keepalived_vrrp:
VRRP_Instance(VI_1) Received lower prio advert, forcing new election
2010-05-10T10:02:02-05:00 <syslog.info> se1 syslog-ng[12531]: Log
statistics; dropped='tcp(......)=0', processed=.....
-------------- next part --------------
An HTML attachment was scrubbed...
URL:
<http://lists.centos.org/pipermail/centos/attachments/20100512/b5dd442a/attachment.html>

Yungwei Chen wrote:
>
> Hi,
>
> I found some info messages below in /var/spool/mail/root.
>
> To reduce the size of that file, I'm wondering if there's a way to 
> prevent those unimportant messages from entering /var/spool/mail/root. 
> Thanks.
>
> 2010-05-10T10:32:27-05:00 <authpriv.info> se1 su: 
> pam_unix(su-l:session): session closed for user root
>
> 2010-05-10T10:01:28-05:00 <local1.info> se1 Keepalived_vrrp: 
> VRRP_Instance(VI_1) Received lower prio advert, forcing new election
>
> 2010-05-10T10:02:02-05:00 <syslog.info> se1 syslog-ng[12531]: Log 
> statistics; dropped='tcp(??)=0', processed=?..
>

um, that looks like stuff I'd expect to see in /var/log not in 
/var/spool/mail