I just tried printing a message.  Half of it was plain text the other html; i.e.,


--------------Boundary-00=_EUO7GR72Q7BNTT4D7TH0
Content-Type: text/plain; charset=UTF-8

Fya

----------Original Message----------

Forwarded mesage

--------------Boundary-00=_EUO7GR72Q7BNTT4D7TH0
Content-Type: text/html; charset=ISO-8859-1
Content-Transfer-Encoding: quoted-printable

<div>hi </div>
<div>=A0</div>
<div>More stuff;.</div>

<div>=A0</div>
<div></div>

--------------Boundary-00=_EUO7GR72Q7BNTT4D7TH0--


I get a "formatting message..." notice in the notification area, but nothing happens.  

Attaching gdb to evolution gives the following backtrace:
0xb613801d in poll () from /lib/libc.so.6
(gdb) thread apply all bt full

+ Trace 217248