The {pubfeed}/{source} parameter indicates the main source and is blacklisted in the same way you receive it, while {source_subid} indicates its subids and is blacklisted with a “.” from the beginning.
So, if you want to add {source_subid} = 12345to the blacklist then it has to appear like this:
- .12345
Dan Shomron 10, Herzlyia, Israel 46185
+972 9-861-7040