E-mail with obfuscated code / no trace in e-mail server

Question

I've got a situation where one of my clients sent me an e-mail with what appears to be obfuscated shell code. The really bizarre thing here is that I see no trace of this e-mail showing up in the mail server and the headers are almost blank.

Has anyone seen anything like this? Is this a cause for concern?

The (obfuscated code) is listed below.

-----Original Message-----
From: 
Sent: Thursday, January 17, 2013 11:30 AM
Subject: 

----boundary_64354_0d34ef45-e6e9-4610-8382-1fdd2040fd60
Content-Type: text/plain; charset="utf-8"
Content-Transfer-Encoding: base64

**BASE64 data** 

----boundary_64354_0d34ef45-e6e9-4610-8382-1fdd2040fd60
Content-Type: text/html; charset="utf-8"
Content-Transfer-Encoding: base64

PGh0bWw+DQogIDxoZWFkPg0KICAgIDxNRVRBIGh0dHAtZXF1aXY9IkNvbnRlbnQtVHlwZSIg

(truncated)

Answer 1

This is not obfuscated code, it is just base64. You can decode it on this site. It is an email containing a flight reservation confirmation. I don't know if it should be publicly available, maybe you should edit your post. You can read more about email encoding here.