Path (graph) shower utility

[bearophileHUGS at lycos.com]

Thank you Jorgen, now I understand the question, and the answer isn't
difficult :-)

Graphviz is good enough for this purpose.

>but IIRC there are Python bindings for it as well.<

Durumdara can use an email module to extract data, then a graph library
to create the graph, and then save the result in dot format for
Graphviz.
My Graph is probably enough:
http://sourceforge.net/projects/pynetwork/
Otherwise NetworkX is good:
https://networkx.lanl.gov/
There are other libs around, I have seen a new one quite recently.

Bye,
bearophile