Depends on what you mean.
"I made it specially for you" means that something about the way I made it was special, and that I made it for you.
"I made it especially for you" means that I made it specifically for you, ie, I made this thing with only you in mind. It may not have been made in any special way, but was intended only for you.
Clear as mud? I posted this especially for you. Not specially for you, though; I'm always writing like this.