Hi there, hypnos611. Great question and thank you for posting here in the community! Are you able to see the email address it was sent from and does it look like a valid Comcast domain, such as @Comcast.com?
It is indeed odd that you aren't able to respond to the feedback email, but you can visit https://comca.st/2JDjNWt to submit your feedback as well at any time! 🙂