[CentOS] Not receiving mail

[John R Pierce]

  On 10/18/10 2:08 PM, Dotan Cohen wrote:
> I see now, since the last postfix restart the log is filling up with these:
>
> Oct 18 22:59:42 mercury postfix/smtpd[11318]: fatal: open database
> /etc/aliases.db: No such file or directory
> Oct 18 22:59:43 mercury postfix/master[7816]: warning: process
> /usr/libexec/postfix/smtpd pid 11318 exit status 1
> ....
>
> To what must I change /etc/aliases.db? Which fine manual should I be reading?

in sendmail at least, the command `newaliases` parses /etc/mail/aliases 
and creates /etc/mail/aliases.db