response 298 of 299:

Sep 5 16:58 UTC 2002

There is a robots.txt file suggesting the conference not be indexed. 
Not sure if that's what did it, but it seems to have worked mostly. 
Though I wouldn't be surprised if some robots searching the web for
email addresses to sell to spammers don't thumb through Grex's
conferences with regularity in spite of the robots.txt file, reputable
search engines seem not to.