Need help understanding DKIM / SPF

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http://forums.cpanel.net – All of my domains are registered with internet provider in Serbia (Orion Telekom). And internet provider allows me to change all of my DNS zones, so I can easily configure all of my domains. All of my web sites and email server are hosted in Germany (Contabo). So, when I enable DKIM / SPF, cpanel creates DNS zones at Contabo. So, my questions are: 1. How to setup DKIM / SPF DNS zones to properly function? 2. Do I have to copy Contabo txt records to Orion Telekom and which values? 3. "SPF enable" creates txt with IP address at Contabo "v=spf1 +a +mx +ip4:xx.xx.xx.xx?all" (HowTos)