The only thing to watch with respect to having your own domain, is if you use the Metrocast email server(s).
Generally, block lists are by IP address and not by the domain, which means the email (SMTP) server(s) would be blocked regardless of the originating domain name. I have seen some domain based block lists, but this usually also involves other checks at the server such as SPF records, etc. to verify the domain, since names can be easily faked and used by anyone. The domain of the sending SMTP server is usually checked by doing a reverse lookup on the IP, and then a corresponding forward lookup (blah, blah, blah
)
The way block lists are handled varies quite a bit depending on the spam blocking software in use at the receiving end, and the policies the company has in place with respect to what does and does not end up on a block list.
Some entities will block entire groups of IP addresses belonging to an organization, others will only block the individual offending IP. Some places spend a LOT of money on email filtering, but most use simpler solutions.