You need to modify the smart action that opens the email sending window.
By default it is set to open internet exporer with a mailto: url. That's why you get the empty web page.
I've never used Lotus, so I don't know how to configure it. Generally, you'll have to find out how to call Lotus from the command line to cause it to open a new message. Then configure this as a smart action, replacing the default one.
IE isn't your default e-mail application. You need to create a new application, for example: Name: Lotus Notes Command Line : C:\Program Files\Lotus\Notes\notes.exe Start in : C:\Program Files \Lotus\Notes\ Description : Startup Lotus Notes After that you need to change the smart action to open the application just created, because it is set to open IE application (by default).