Greetings from 1010wins.com!
Reid Fishler recommends you check out this story from 1010 WINS:
Union: 'Close the Facility'
http://1010wins.com/StoryFolder/story_1648051444_html
Since the nanog list is run on a majordomo server, please add
to the taboo headers in the list config file. That will stop this spammer who is forging the email address of a valid poster to relay spam from that server.
Further, adding
Content-Type: multipart/alternative;
to the taboo headers will stop the HTML crap (from this server and others (the spammer is probably going to go looking for new relay webhosts)), and all the other annoying attachments too.
jc