In case you are unable to enable  sendmail using Virtuzzo -> system services -> xinetd -> sendmail section.

To fix this modify /etc/xinetd.d/sendmail file

 Modify :

service smtp
{
disable=yes
socket_type     = stream
protocol        = tcp
wait            = no
user            = root
group           = root
server          = /usr/sbin/sendmail
server_args     = -bs -Am
nice            = 5
instances       = 10
}

Modify it to :

service smtp
{
disable=no
socket_type     = stream
protocol        = tcp
wait            = no
user            = root
group           = root
server          = /usr/sbin/sendmail
server_args     = -bs -Am
nice            = 5
instances       = 10
}

Now restart the xinetd using: /etc/init.d/xinetd restart

Verify the sendmail status using Virtuzzo -> system services -> xinetd -> sendmail. You should see that the status of sendmail has now changed to “enabled”.

Happy Bookmarking!