Possible to identify email browser?

I wrote a very simple email app for a client.
Wouldn’t you know it. The boss uses Lotus Notes and it doesn’t support CSS and
it also will not download the images in the HTML emails.

&^$#@!@#^&%$!

Any way around this?
Like maybe identifying that the user is on a certain browser and mailing an attachment
as an alternative?

Anyone else encountered this problem?

Grasping at straws and trying to make a dollar.

JB