/usr/lib/sendmail symlink missing

Hello,

I have an CentOS 6 x86_64 server, with plesk12.0.18 MU#19.
I cannot send emails from some CGI program.
CGI program using /usr/lib/sendmail command.

# ll /usr/lib/sendmail
lrwxrwxrwx 1 root root 30 2月 10 11:32 2016 /usr/lib/sendmail -> /etc/alternatives/mta-sendmail
# ll /etc/alternatives/mta-sendmail
lrwxrwxrwx 1 root root 25 2月 10 14:06 2016 /etc/alternatives/mta-sendmail -> /usr/lib/sendmail.postfix
# ll /usr/lib/sendmail.postfix
ls: cannot access /usr/lib/sendmail.postfix: No...

/usr/lib/sendmail symlink missing