[David Bremner]
> Notmuch is accepting the input, it just isn't displaying it the way
> you want.

Well, I guess that is mostly a question of semantics and definitions.
To me it isn't really accepting the input when I try to reply to an
email with the problem in question and end up with

  On Mon, 20 Jun 2011 11:12:00 +0200, "=?iso-8859-1?q?=D8yvind_Normann?=" <oyvind.normann@example.com> wrote:

One thing is not seeing the name properly in my client, but
broadcasting to my contacts my tools inability to process the From:
field is not something I can stand for.  So I really hope this can be
solved.  I hope Austin is right that this bug is fixed in later
versions of gmime.  I will try to upgrade and see if it solve the
issue.
-- 
Happy hacking
Petter Reinholdtsen