Residential use of home mail server blocked on port 25

https://corporate.comcast.com/comcast-voices/updated-management-of-smtp-port-25

Upon request to our Customer Security Assurance team this block can be removed, enabling access to use port 25 for other email domains, though the comcast.net email servers will no longer accept submission via port 25.

I spoke with the CSA team, as well as Techincal support, Advanced Repairs, and a sales person for Business Internet, and none had a clue what I was talking about.

I want to run a personal mail server at home, which requires port 25 is unblocked. I've confirmed that both inbound and outbound traffic on that port is blocked within the comcast netowrk.