Yahoo Mail is one of the most popular email services, with almost 228 million users. Chances are that you are one of them. If you would like to enhance your experience, you can easily add a nice email signature with all your contact details, your photo and even a banner. This will make your emails more business-like and professional. Even if you only use your Yahoo Mail for private communications, having a nice email signature will show that you are reliable and pay attention to details.