I have tried several times, installing Perfect Server for Centos 6.5 on my dotblock VPS. (Centos 6.4 has been running perfectly on same system) Dovecot fails to start because there is a missing smtpd.cert file in the /etc/postfix directory every time. I have tried yum remove postfix, then yum -y install postfix followed by an Ispconfig update and reconfiguring the services, but its still not there and dovecot fails with: Starting Dovecot Imap: doveconf: Fatal: Error in configuration file /etc/dovecot/dovecot.conf line 7: ssl_cert: Can't open file /etc/postfix/smtpd.cert: No such file or directory How can I recreate it? Added: I did a complete reinstall with the same result. This time, I executed "/etc/init.d/dovecot restart" just before installing IspConfig, and it restarted perfectly. Right after installing Ispconfig, dovecot would not longer restart and threw the error noted above.