All Right? is a wellbeing campaign developed in response to the devastating Canterbury earthquakes of 2010 and 2011. Vulnerable groups post-disaster include people with a prior history of or unresolved mental illness. This research focussed on the reach and impact of All Right? specifically for tangata whaiora/mental health service users. Evaluation objectives were primarily focussed on assessing the extent which mental health service users engaged with All Right? and to determine the impact of this interaction. Both qualitative and quantitative methods were used to gather data. Findings indicated that mental health service users responded to All Right? to a greater extent than the general target population, e.g. about one-third (37%) of respondents to a population based Christchurch survey agreed that they had done activities as a result of what they had seen or heard of the All Right? campaign compared with approximately two-thirds (68%) of respondents to the mental health service users’ survey. One of the key factors facilitating mental health service users’ engagement with All Right? appears to be that the campaign was directed at whole-of-population level, therefore engagement was not defined by being a mental health service user. Engagement was also likely to be facilitated by the campaigns perceived impact of reducing mental illness-related stigma. This research concluded that population-wide wellbeing campaigns in the post-disaster context, when done well, can positively impact the wellbeing of the overall population, including mental health service users.