@ColinTheMathmo I would consider a delay in email a feature, not a bug. People seem to confuse email with instant messaging. Email is supposed to be asynchronous. I guess some instant messaging tools are also supposed to be asynch, but apparently everything should be like SMS. #getofmylawn

@bremner The system I'm looking and and developing a "proof of concept" for might require it. It's a fully encrypted "dead drop" messaging system that disguises most of the meta-data, as well as the content. But a PoW might be needed to throttle malicious misuse.

@ColinTheMathmo BTW, there is ongoing work on "Memory Hole" for encrypting message metadata in email. Possibly of interest.