Having issues sending email to comcast.net addresses? Comcast provides a handy web form for requesting automated removal from their blacklist. There’s just 1 small problem. It doesn’t do a damn thing. And that’s the only method they provide for removal.
However, if you do some digging, you’ll come across Comcast Security. They don’t say much about email on their website, and advertise it mostly as a law enforcement and DMCA response line. You can call Comcast Security at 1-888-565-4329. Option 2, then 1 and 1 again will get you to their email blacklist department. Expect hold times of 30-45 minutes before you get someone, or leave a voicemail. This is the only way I’ve found to get off their blacklist.