Comment 4 for bug 771557

Many thanks! Debug output very nice

$ sudo /usr/sbin/dovecot -F -c /etc/dovecot/dovecot.conf
doveconf: Warning: NOTE: You can get a new clean config file with: doveconf -n > dovecot-new.conf
doveconf: Warning: Obsolete setting in /etc/dovecot/dovecot.conf:25: 'imaps' protocol is no longer necessary, remove it
doveconf: Warning: Obsolete setting in /etc/dovecot/dovecot.conf:25: 'pop3s' protocol is no longer necessary, remove it
doveconf: Warning: Obsolete setting in /etc/dovecot/dovecot.conf:102: ssl_cert_file has been replaced by ssl_cert = <file
doveconf: Warning: Obsolete setting in /etc/dovecot/dovecot.conf:103: ssl_key_file has been replaced by ssl_key = <file
doveconf: Warning: Obsolete setting in /etc/dovecot/dovecot.conf:249: namespace private {} has been replaced by namespace { type=private }
doveconf: Warning: Obsolete setting in /etc/dovecot/dovecot.conf:569: ssl_cert_file has been replaced by ssl_cert = <file
doveconf: Warning: Obsolete setting in /etc/dovecot/dovecot.conf:570: ssl_key_file has been replaced by ssl_key = <file
doveconf: Warning: Obsolete setting in /etc/dovecot/dovecot.conf:639: ssl_cert_file has been replaced by ssl_cert = <file
doveconf: Warning: Obsolete setting in /etc/dovecot/dovecot.conf:640: ssl_key_file has been replaced by ssl_key = <file
doveconf: Warning: Obsolete setting in /etc/dovecot/dovecot.conf:722: protocol managesieve {} has been replaced by protocol sieve { }
doveconf: Warning: Obsolete setting in /etc/dovecot/dovecot.conf:894: add auth_ prefix to all settings inside auth {} and remove the auth {} section completely
doveconf: Warning: Obsolete setting in /etc/dovecot/dovecot.conf:979: passdb shadow {} has been replaced by passdb { driver=shadow }
doveconf: Warning: NOTE: You can get a new clean config file with: doveconf -n > dovecot-new.conf
doveconf: Warning: Obsolete setting in /etc/dovecot/dovecot.conf:25: 'imaps' protocol is no longer necessary, remove it
doveconf: Warning: Obsolete setting in /etc/dovecot/dovecot.conf:25: 'pop3s' protocol is no longer necessary, remove it
doveconf: Warning: Obsolete setting in /etc/dovecot/dovecot.conf:102: ssl_cert_file has been replaced by ssl_cert = <file
doveconf: Warning: Obsolete setting in /etc/dovecot/dovecot.conf:103: ssl_key_file has been replaced by ssl_key = <file
doveconf: Fatal: Error in configuration file /etc/dovecot/dovecot.conf line 103: ssl_key: Can't open file /etc/ssl/private/ssl-mail.pem: No such file or directory