Adding mail aliases

[Robert Moskowitz]

So I have been taught it is not enough to edit /etc/aliases, you also 
have to run newaliases to update /etc/aliases.db.  Both these files 
exist in the base install, along with mailx.  But newaliases does NOT 
exist.  A 'quick' yum whatprovides shows that newaliases is installed 
along with any of:  exim, sendmail, postfix, or ssmtp  :(

So does mailx use /etc/aliases.db?  If it does, why no newaliases, and 
how to install only newaliases, not a whole MTA?

Well for now, I can quite live with root mail going to root's maildir.