[CentOS] couple of problems

Hello all,

I finally got spamass-milter and clamav-milter running, but have one 
error I've not been able to determine what is happening.  From the log 
entry I see this line:

 SYSERR(sa-milt): hash map "Alias0": unsafe map file /etc/aliases.db: Permission denied: 39 Time(s)

any pointers here?

The 2nd item is with yum.  I attempted to update, and wound up getting a fail on a dependency, yet the packages (clamav-db & clamd) are in fact installed.  How do I use yum to tell it they are in the system?  

Thanks..

Sam