[exim] DMARC DKIM ?????

[eximmail]

OK so my server hosts several domains. I have successfully setup DKIM 
and everyone is passing using the main server as the outgoing SMTP.
The problem I am having is that the DMARC fails for all domains but the 
main server.
What I want to do is send from main.server.com and have 
u...@whatever.com pass the DMARC and all searches have failed for a 
simple fix for a simple idiot. Everything found is for Debian and 
others. I have tried some to no satisfaction.
I am running Exim 4.80.1, Dovecot on SUSE 12.3 I am at wits end can 
anyone shed some light or suggest a how to to make this work? (or even a 
good tut for a dummy's "R" us)

Thanks
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