Not receiving emails from USPS Informed Delivery or Target

I, like many others, have stopped getting my USPS Informed delivery daily emails. From the Xfinity forums website, it indicates the "problem" is with an "ESP" called "mail gun" or "Sinch" who is a third party intermediary that handles this type of daily, mass mailed email. For some reason, this email is put on a "suppression" list and it takes Xfinity intervention to take it off the suppression list. Please do so. Thank you. I am sending this request as suggested on the forum in hopes to have my email address removed from suppression. Thanks in advance!