I often find it useful to think about these matters by mapping them over to the real world. Anonymous remailers are really quite common. Here are a few common sources: 1) Academic journals which review papers. These often keep the names of the reviewers and the names of the paper authors hidden to allow people the chnace to speak freely. 2) Newspapers with personals sections offer both anonymous mailboxes and anonymous voiceboxes for obvious reasons. 3) The WSJ also offers these advertisements for executive searches. 4) The Police, in some cities, maintain anonymous tip lines. They also occasionaly offer cash rewards to these anonymous tipsters. I think the NYPD has a anonymity office set up to do just this. I realize that the cypherpunk mailing list likes to cloak itself in the romance of the counter culture, but in moments like this it might make sense to think about how mainstream and suburban and respectable the concept of anonymous mailers can be. In many cases, authority reacts to the perceived threat-- not to the threat itself. -Peter Wayner