DKIM Key problem - plesk without DNS

Hello there,

i have a problem with setting up DKIM.
- strato vserver with ubuntu + plesk 12.5 with extern Nameserver from another Hoster.

I activated DKIM for outgoing Mails in the Mailserver Config. I tested it now with one Domain on my server and activated it on the Domain.
Normally would Plesk write the data like the DKIM key in the DNS Panel in Plesk. But i dont have DNS installed.
So i went to root on the server. I go to etc/Domainkeys/theTestDomain/default
This file i download to...

DKIM Key problem - plesk without DNS