DKIM / Exchange 2013

Question

Hi, I have 2 exchange servers 2013 configured as MBX and CAS, and I use Sophos UTM as Proxy SMTP, now I want to configure DKIM and DMARC, where should I configure them? in the cas, mbx or UTM? 
 
 Thanks 1000

Jaydeep · Answer

Hi papali 
 You can configure DKIM on Sophos UTM SMTP proxy using this KBA: Sophos UTM: DomainKeys DKIM setup guide but you can not set up DMARC. There's a feature request for it here: https://ideas.sophos.com/forums/17359-sg-utm/suggestions/2554345-enable-dmarc .

papali · Answer

Thanks, now it is clearer to me how spf, dkim and dmarc works. 
 I add this link that I had read before https://community.sophos.com/kb/en-us/115946 
 Thanks again.