You're probably used to seeing generic email signatures that tell you that the message was sent from one of the popular devices such as an iPhone or Samsung Galaxy. These default signatures are purposely created so they can get some free exposure from the tens of millions of daily users that haven't figured out how to change the default. It's clearly working for them as evidenced by the number of messages that we stil see with these free ads at the end. The good news is that you can change that default signature fairly easily and it may actually provide you with some additional benefits. If you're in business, you email signature is a great opportunity to do some subliminal marketing by including your website, blog or any contact info you want to distribute to the world. If you aren't sure how to do it, here are some links for the current and older smartphones: iPad, iPhone and Android devices: https://www.pcmag.com/news/how-to-change-your-mobile-email-signature Blackberry: http://helpblog.blackberry.com/2013/07/blackberry-10-how-to-set-up-an-email-signature