Quicksilver: Email To... (Send) opens window?

I have OS X 10.5.2 and latest QuickSilver installed.

The problem is that whenever I try to use action "Email To... (Send)" QuickSilver (or maybe Mail - don't know what application does that) opens Mail Composition window, fills field and sends email automatically. Such "Pop-Up" Window stays on Screen for about 1-2 seconds and I am not doing anything with it everything is automated but it annoys me. I thought "Email To... (Send)" action should work in background without even opening any windows.

How can it be fixed? Is there anyone else experiencing the same odd behavior?