Multidomain / IP Address Setup (Dovevot 2.2.10 on CentOS7 ) is failing: Fatal: Couldn't parse private ssl_key: error:0906D06C:PEM

[dravion.smith at gmx.net]

Hi,
I want to say hello and here is my big problem ;D

Iam trying to archive a Postfix/Dovecot 2.2.10 CentOS7 Multidomain Setup 
with multiple (valid
StartSSL Certs), but iam only able to run a single Domain Cert server only.

ps: I need a multiple domainssetup for every customer and it is not an 
option for me redirecting any email
to a single domain server. I really need this setup working.

IMHO: I think it SELinux could interfere with multiple Certs in diffrent 
folders (it is activated in CentOs7 by
default and is needed by other apps)

Ok, here is my logfile data:

systemctl start postfix.service [OK]
systemctl start dovecot.service [OK]

/var/log/messages
*systemd: Stopping Dovecot IMAP/POP3 email server...
*systemd: Starting Dovecot IMAP/POP3 email server...
*systemd: Started Dovecot IMAP/POP3 email server.

/var/log/maillog
*dovecot: master: Dovecot v2.2.10 starting up for imap, pop3, lmtp (core 
dumps disabled)

### This works (Thunderbird, Outlook 2013, Opera Mail ect.) ####

local mydomain01.tld {

   protocol imap {
       ssl_cert = 
</etc/ssl/domains/mydomain.tld/imap/imap.mydomain02.tld.crt.pem
       ssl_key = 
</etc/ssl/domains/mydomain.tld/imap/imap.mydomain02.tld.key.pem
   }

}

### this 10-ssl.conf ### --- FAILS (the error occurs after an email 
client accesses IMAP Folders)
local mydomain01.tld {

   protocol imap {
       ssl_cert = 
</etc/ssl/domains/mydomain.tld/imap/imap.mydomain02.tld.crt.pem
       ssl_key = 
</etc/ssl/domains/mydomain.tld/imap/imap.mydomain02.tld.key.pem
   }

}

local mydomain02.tld {

   protocol imap {
       ssl_cert = 
</etc/ssl/domains/mydomain.tld/imap/imap.mydomain02.tld.crt.pem
       ssl_key = 
</etc/ssl/domains/mydomain.tld/imap/imap.mydomain02.tld.key.pem
   }

}

/var/log/mailog ### Error log ###
Aug 14 12:50:38 matrix dovecot: imap-login: Fatal: Couldn't parse 
private ssl_key: error:0906D06C:PEM routines:PEM_read_bio:no start line:
Aug 14 12:50:38 matrix dovecot: master: Error: service(imap-login): 
command startup failed, throttling for 60 secs

I really dont know why a single domain is no problem but if i enable 
multiple domains dovecots
start with any error, even if i set debug verbose leven to extrem high 
but if i access dovecot with
Thunderbird my server loggile explodes with something like this Couldn't 
parse private ssl_key: error:0906D06C:PEM but the certs are 100% valid 
and checked over and over again.

Any help is greatly appreciated!

Greetings,
Dravion