My question is the ‘Rule’ or filter account specific or is it global. Does it apply across ALL email accounts.
As far as I know the rules including the blacklists apply across all accounts. If that’s not correct someone will update this thread.
Have you tried a “adding a custom rule” to block “with words found in the header” ? As in @Gary example in the following thread post.
AND, just where are the blocked domains listed in case I want to reverse it?
If you have V10 the blacklist is via “Menu / Settings (Preferences) / Mail / Blacklist” & Whitelist and click “Manage Blacklist” at the bottom
If you have up to V9, “the blacklist will appear in Rules” where you “dblclick to open / manage it”.