Linux CentOS with HyperVM(lxlabs) do not send an e-mail

I tried to send an e-mail from within Linux command line. It never arrived and command "mail" not contained any Delivery failure mail.
I did command "service postfix status" and it returned error:
master dead but pid file exists
# service postfix restart
Shutting down postfix: [FAILED]
Starting postfix: [ OK ]
But when i check status it is stopped. So i watch log file:
# tail /var/log/maillog
Apr 25 16:34:31 scvpsnode postfix/postfix-script[311561]: starting the Postfix mail system
Apr 25 16:34:31 scvpsnode postfix/master[311564]: fatal: bind port 25: Address already in use
# netstat -tlnp|grep 25
tcp 0 0* LISTEN 316012/xinetd
tcp 0 0* LISTEN 16081/sendmail
tcp 0 0* LISTEN 35217/exim4
tcp 0 0 :::25 :::* LISTEN 835794/master
tcp 0 0 :::2525 :::* LISTEN 35217/exim4
tcp 0 0 ::1:25 :::* LISTEN 812180/exim4
I see the "sendmail" so i did:
service sendmail stop
service postfix restart
service postfix status

and i see it is running and my e-mails are now delivered.

I disabled sendmail by redhat/centos command: chkconfig sendmail off