One other point I'd make with regard to Marc's message is that if PGP itself is the problem, there's no reason the remailers can't use RIPEM. That's legal in the U.S., so the legality issue would not arise. This might be a good approach to take in broaching the subject with administrators. I haven't looked at RIPEM much but I'm sure the remailers could use it just as easily as PGP. Even non-encrypting remailers can provide basic anonymous posting and mail, if those would be more acceptable.
I thought about this. The major problem is that once the PEM beta-testing period ends, all keys must be registered with "approved" (by RSA) central authorities. I highly doubt they'd issue pseudonymous keys, but maybe they would allow someone to set up a heirarchy especially for that purpose. I'm not convinced. Marc