Confirmation Of Spells Effectiveness Options

I've been having this problem that keeps comming up. Lets say you place a spell on someone that lives off from a distant away. Like a letter spell. How do you know your spell has worked or not?

Actually that wasn't the point that I was trying to make. When spellcsating it is essential to believe that the spell you are casting will work. If you leave yourself the wiggleroom to have doubts or questions of the spelld effectiveness you are then shortcircuited the spell. You must know whilst the spell is cast that it will be effective. This involves the use of a certain kind of mindset. Build the image of your desire, raise power, focus the power through the desire and FIRE! If you doubt your effectiveness then you uncover a serious source of failure in your spell. FIRE and then forget it. Let the magic do its stuff. It can't do its stuff with you poking and prodding it. That will drain its strength that was hampered by your doubt. I can't articulate it better than that at this present moment. This is an OPINION...of course, you must make up your own mind. I can understand the frustration in this. Its like not thinking of the colour blue... (IMG:style_emoticons/default/smile.gif)