Your dog will gradually learn that it is not necessary to greet you with submissive urination, and the behavior will gradually disappear. Occasionally, there exists a dog that never quite gets over it. This dog will still greet long-lost special friends with a puddle. Again, scolding does no good. Washable throw rugs by the front door and a roll of paper towels handy will help keep your sanity.
Some dogs are much harder to housebreak than others.
There is usually a reason for this. Puppies purchased from pet stores have usually been bred in puppy mills. In both places, they are usually kept on wire mesh. This allows the excreta to fall through, but it stays just underneath them until somebody cleans it. They never get away from the smell, so they become accustomed to it until it means nothing to them.