The Glass Envelope Edition:
There are actually 2 versions: Thin Glass (pic on left) and Thick Glass (pic on right).
I have attached both cabs to the bottom of this post.
The Thin Glass cab is called HD_Transparant_Envelope.cab Thank you Blessed HD over at
xda.
For the Thick Glass edition, install the Giangishanghaienvelope cab. (Although it was cab'd up by DavidK at FuzeMobility, it was named after its creator at
xda.)
FuzeMobility also did a write up about it
here.

Disable TF3D before the install. Install the cab. Soft reset. Enable tf3d.
(credit for the pic goes to David K over at FuzeMobility)
Original TF3D Email Tab Remove Email Tab:
It removes the part of the envelope from the tf3d email tab. Your email actually appear over the envelope giving you more of the message.
To install:
1. Disable tf3d
2. Install the FuzeMobilityNoEnvelope.cab
3. Soft reset
4. Enable tf3d
Thanks for the .cab go to Bugsykoosh over at xda and his post at
fuzemobility.com with the specific article
here.
Although it is recommended, I did not disable TF3D before installing.
I just installed the cab. Then soft reset.