There is no possibility to extract receivers with libpff-python. A workaroud is to export the entire pst file and search for the message folder. It will contains some usefull txt files.
Is foreseen to implement this fundamental python binding in python?
Also a pffexport with a:
pffexport -f all --guid '7a034eb1-25ce-4655-af6a-ab5070aa46aa'
option can be usefull to extract a specific message, without writing trash to disk