Emails sent to comcast.net addresses getting dropped but not bounced

Hello, just trying to get the attention of someone from Comcast support to look into this. I use a domain with a ".email" TLD, so mydomain.email because all the normal .com .net TLD's were taken. The mail service is hosted by Mailfence which is a paid service, not a cheap/free solution. I have an SPF record correctly setup for my domain to help limit spoofing, no issues there. My email works great for emailing just about anyone, with 100% success I can email:

• Gmail
• Yahoo
• Outlook.com/hotmail
• and a wide variety of .com addresses such as local businesses

In all the above cases my emails land in recipients inboxes, never flagged as spam.

For some reason, people with comcast.net email don't receive my emails:

• They don't go to the Inbox
• They don't go to Spam/Junk
• They don't get filtered or hit a rule that's moving or deleting them
• I have never received a bounced email back with a reason

Many of my family members use their comcast.net email addresses which is how I found the problem to begin with and did some troubleshooting. The only thing I can think of would be that comcast at one point detected spam being sent from the same IP as the mail server since it's a hosted provider, meaning I'm not the only domain hosted there and maybe someone else's hosted email domain was compromised or spamming, however no other email service is rejecting my mail (sent from Mailfence), it only appears to be Comcast. Perhaps @CCAntiSpam could take a look? Pleeeeease and thank you! A DM or email to me would be fine and I can share the domain with you to help with your search.