[exim] nhash - how to reproduce?

I am looking at nhash in exim to store email into different folders to
prevent too many messages in a single folder.

How does nhash actually work though? If I have exim store the message
based on this hash but I want to look up where said message was stored
using some other system, how can I calculate the hash to I know where the
file is?

Searching this group this topic came up back in 2010 but the link from back
then is dead.


So I guess I am looking for the logic, so I can produce it in another
language so I can find my mail...


Regards,


Rob