ISO-8859 header fields

Hello,

  Is there a way in mhonarc to process correctly header fields that
contains accentuated characters with ISO-8859 encoding?
I'm using mhonarc 1.2.0, and the this kind of messages appear ugly in
the index pages, as you can imagine...

Please answer directly to:
Eric(_dot_)Madelaine(_at_)sophia(_dot_)inria(_dot_)fr