The ability to make and receive voice calls and messages on Alexa devices has been a welcoming feature for many users. However, one important feature that is enjoyed on most if not all messaging services has been missing: the ability to block unwanted contacts. According to The Verge, Amazon has recently released an update to the Alexa app that lets you do just that. You simply find the person in the app, and choose block contact. Be sure to update your Alexa app before using the feature.
Source: The Verge