This can be done by extracting the data (ANY data) directly from Mystic BBS through websockets.
I wrote an Mystic Webmail client proof of concept by using websockets and a custom Mystic connect.mpx and startup.mpx.
See proof of concept here:
https://thawk.nl/mystic-webmail/.
This shows that you can directly retrieve _any_ data live from any mystic board instantly without delays.
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