Thanks, I hadn't seen that before. End-to-end encryption is needed to increase the load on a spammer as much as possible. Even if the spammer tries to re-gener

Thanks, I hadn't seen that before. End-to-end encryption is needed to increase the load on a spammer as much as possible. Even if the spammer tries to re-generate the message "at retrieval time" the receiver should request retrieval several times (to obfuscate when the message is actually read) and the message should use multiple iterations of a cipher (and possibly HMAC) after an initial DH negotiation, or any other means to increase the cost for a spammer _and_ tie a message to a unique sender for reputation-tracking purposes.