OT: NFilter and News.individual.net

I'd like to block a certain person (not this group) and anyone who replies to them. I've done this before using Message-ID and References, but News.Individual.net seems to generate random gobbledygook for the message ID for a user from session to session. Any other thoughts or is there a pattern to the News.Individual.Net Message-IDs.
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
Add image file

HomeOwnersHub.com is a website for homeowners and building and maintenance pros. It is not affiliated with any of the manufacturers or service providers discussed here. All logos and trade names are the property of their respective owners.