I am having the same problem...whereby emails sent to comcast.net email addresses are not being delivered. I worked on this with Google, and they were not able to resolve the problem because everything on their end is configured properly. I found a forum entry ( https://forums.xfinity.com/t5/Email-Web-Browsing/Gsuite-Messages-not-getting-through-to-Comcast-net/... ) from another user who had the same issue, and their domain had been flagged as problematic by Comcast. Can you please take a look at my domain to see if we've been similarly flagged?
I am also a comcast customer although the domain we are trying to send from is arae.com
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