substack emails blocked

Comcast support can provide no other explanation and offered to take this to a higher level of support. I said no thanks because I've already switched to a non comcast email address and cannot switch back.

@rockiestone I'm going to DM you to get some details specific to your issue, I can see substack emails being delivered successfully on the platform, we just need to figure out what you are having an issue.  Thank you

Hello and Good Morning, @rockiestone Thank you for reaching out to Xfinity Support on the Community Forum. Did you get the email issue figured out, or did you need further assistance?

I am sorry to read that, @rockiestone I will be happy to work on it with you. Is sounds like a business account, correct? I assume that you have tried all the basic troubleshooting, correct? Filters, forwarding, and spam settings?