I've added some documentation (perldoc mhisto) and filtering features:
You may specify a comma or pipe-delimited list of address (substrings)
to be used in a regular expression to limit the set of per-sender
graphs to be printed. The switch may also be given as a negated form
--notfrom.
If you wish to only produce the summary graph, supply a -from switch
with a substring that will not match any address such as @@
http://pthbb.org/manual/software/MH/mhisto
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