Email Problem at my AWS Amazon Server

Hi there,
i installed CWP at my two aws amazon server
but both server have same problem and same error with mail
cant send and receive email
this is the mail log

Code: [Select]

Jan 24 15:18:11 ip-172-31-28-190 postfix/smtpd[4110]: fatal: open database /etc/aliases.db: No such file or directory
Jan 24 15:18:12 ip-172-31-28-190 postfix/master[1216]: warning: process /usr/libexec/postfix/smtpd pid 4110 exit status 1
Jan 24 15:18:12 ip-172-31-28-190 postfix/master[1216]: warning: /usr/libexec/postfix/smtpd: bad command startup -- throttling


try rebuilding your mail server from CWP.admin