Multipart MIME in Outlook 2010

[WyomingKnott]

I get multipart MIME messages. In outlook 2010, they look like this:
Content-Type: multipart/alternative;
boundary="_000_SN1PR15MB02079A5D51FB185F70DD0AFAC8960SN1PR15MB0207namp_"

Content-Transfer-Encoding: base64

iVBORw0KGgoAAAANSUhEUgAAAKUAAAA5CAYAAABXj+viAAAAAXNSR0ICQMB9xQAAAAlwSFlzAAAO
xAAADsQBlSsOGwAAABl0RVh0U29mdHdhcmUATWljcm9zb2Z0IE9mZmljZX/tNXEAADIdSURBVHja
7Z0HVFTXu/YHBewtikqQNgyIgAgiomJBRaUMYEOjxm7UaOwGRCzYUbEDCnaqYG+xRqNix4IlVgQR
Gyqxo1Le73nPOYNDM95vXfzfexPW2mtO2Xuf9jvPW/aeQTZjxgxZaZUaNWpUlMvl+nK5bj257t8U
udzQwsLiu9I8n3/L/45Sqp0r5HJ3EyOj+3JDwxS5odEXi6mx/IGZXBHy70P5t5Rq5+Zy+Q8KI2My
MTQi/vxSMZObkNzIeNc/+WHIvQPqDV92tL/f+jODfFcnDPynFL+Ic4N7BuztIZORRqlDaaZQ9GAg

They also contain HTML, which shows as HTML source code. Can anyone tell me how to see these properly in Outlook 2010? Is there a plugin? Do I have to upgrade to Office 365?

Thanks.

 

[COLGeek]

You would often see such "attachments" when someone sent a message with a digital signature on it (like from a CAC/smart card). There is a S/MIME plug-in for Outlook and Outlook Web Access that can be loaded. However, if you don't have a corresponding digital signature device, I don't think you'll be able to "read" the info.

 

[ex_bubblehead]

One (of many) causes is mail sent by Thunderbird and Lotus Notes clients where the "To:" line is left blank when the "BCC:" line is in use. The only fix in these cases is to have the sender resend with a non blank "To:" line.