[Evolution] attachment.dat

[Todd Hicks <electronjockey hotmail com>]

I just started using Evolution 2.28.1.
Messages I receive from Monster.com come as 
Content-Type: text/html; charset=utf-8
The subject is utf-8 encoded also and is interpreted properly, but the
body is interpreted as "attachment.dat", and when I view the source the
body appears as gibberish (presumable binary). If I hit reply I can read
the message. 
I've googled with no success. It doesn't appear to be related to tnef,
as I have that plugin installed. My thinking now is that spamassasin or
bogofilter, so I've temporary disabled those plugins but I haven't
received a message yet to verify.
Anyone experience this or have any ideas?