[CentOS] tail -f /var/log/maillog error

Thu Jan 4 06:24:53 UTC 2007
Barry Brimer <lists at brimer.org>

> When I type the below command, it shows the logs for mail.
> tail -f /var/log/maillog
>
> But , Since this morning, It shows nothing.

Are other logs being written .. /var/log/messages /var/log/secure ... etc? 
Is syslog running?