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One possible problem is that the final destination must then be available to every remailer.
[explanation removed] ok, this one I can understand to be a problem. Can anyone beat this?
Besides, some people may have set up anonymous remailers that aren't public or haven't been announced.
Well, if the mailer hasn't been announced or made public, then it obviously won't be on the list of mailers that Remailer is choosing it's ping targets from. -----BEGIN PGP SIGNATURE----- Version: 2.3a iQCVAgUBLI6RirbAlE4AqlTZAQGmzQP8CdOdShWx9SWcjeID/rdaBeStPmmfs4sW o44Mccp1zKcHRicrr7ELWyEQ28zu7mBGjAuVFKjMDrta8i17sRYvsDchissH+mgw w0qKMge9kYaHvfgrP2K8XMoE79tu3EATBPp32HTF3bBNtrUVV2OPpRSocbtcX4Vc 4VULcmUI4hk= =1YCi -----END PGP SIGNATURE-----