Would this make a good Gmail feature? When you address a recipient but you misspell the name, Gmail would alert you to it. Implementation-wise this could perhaps mean that if the first line contains a word that is close to the recipient's name but a couple of letters off, it counts as misspelling. First and also last names could be handled like this. For instance, if the recipient's name were "Roger", and I'd be writing "Hi Riger",