People around the world who seek to interact with large organizations increasingly find they must do so via mediated and automated communication. Organizations often deploy both mediated and automated platforms, such as instant messaging and interactive voice response systems (IVRs), for efficiency and cost-savings. Customer and client responses to these systems range from delight to frustration. To better understand the factors affecting people's satisfaction with these systems, we conducted a generally representative U. S. national survey (N = 1321). Here, we found that people still overwhelmingly like and trust in-person customer service over mediated and automated modalities. As to demographic attitude predictors, age was important (older respondents liked mediated systems less), but income and education were not strong attitude predictors. For personality variables, innovativeness was positively associated with mediated system satisfaction. But communication apprehensiveness, which we expected to be related to satisfaction, was not. We conclude by discussing implications for the burgeoning field of humanmachine communication, as well as social policy, equity, and the pullulating digital services divide.Customer service now plays out across a spectrum of communication channels. There is still face-to-face or "in-person" customer service, whereby someone interacts with another person, and then there are varying degrees of mediated customer service: over e-mail, social media platforms, and instant messaging chats. In these exchanges, another person is at the other end of the interaction, but the communication is less rich because of the limited visual/audio cues and, in some cases, less instantaneous feedback. IVRs are distinct from computer-mediated communication (CMC) in that they are not computer systems passing information between two people, but rather are secondary communication entities in exchanges. In some cases, IVRs are a communicative gatekeeper prior to an eventual person-to-person exchange, such as when IVRs serve to direct inquiries to appropriate departments [13].Because it uses voice to relay information, IVRs traditionally would be considered a "richer" medium than CMC, which only relies on text. Indeed, when comparing digital customer service channels (text, audio-only, and video), satisfaction corresponded with the digital channel's level of richness [14]. Therefore, one might expect that automated customer service channels like IVR would be preferred over mediated customer service. However, media richness also takes into account how personal or impersonal the communication source is [11]. To our knowledge, this aspect of media richness has not been explored with regards to automated technology that can simulate human-ness but is clearly automated.Indeed, scholars have argued that traditional communication theories predicated on human-human interaction may not directly apply to human-machine communication (HMC) [5] [7]. Media richness theory was developed at the early stages of the online c...