Receiving a letter handwritten by someone you care about is special unlike printed ones. Not only does it show personal touch but the effort has been given. If you can analyze handwriting, a lot more can be seen. Sending it, though, it would be better to use labels for the return name and address for it to be easy to be understood. If you want it to be special then use foil labels. It cannot be avoided, some people really cannot write legibly. There is something with that person’s whole being that makes the writing so. So, in order for your mail to be intact, use labels.