I just replied to an email from a guy who thinks I'm blocking his mail. I'm not, because I don't run a blacklist or a spam filter, and haven't done so for years. I would have loved to have helped guide him in the right direction, but my reply to him bounced because his mail server is misconfigured to use the NJABL blacklist.
The NJABL blacklist has been dead for almost five years.
If you still have it in your email server configuration, you're now going to block a lot of wanted mail. Because the domain's name servers just changed and they have a wildcard entry that now has the effect of "blacklisting the world."
You were warned...almost five years ago.