Hello @yousef,
Welcome to the Klaviyo Community!
I think it would be helpful to share more details on the issue you’re having to see if other Community members have experienced a similar behavior and can provide a solution.
Am I correct in thinking that this sounds like your DNS provider is unable to add CNAME records pointing to sendgrid.net in order to setup a dedicated sending domain?
From reading the response, this sounds to be directly related to a DMARC issue - which Klaviyo has no control over. In fact, DMARC (Domain-based Message Authentication, Reporting & Conformance) is independent form Klaviyo and is something that is managed through your own domain policy.
If you have a DMARC policy in place, setting up and using a dedicated sending domain would allow your Klaviyo emails to pass your domain’s DMARC policy.
I would also suggest taking a look at some past Community post which touches on this topic. I’ve included some below that I think you mind find helpful to get you started:
I hope this helps!
David