In this study, the researchers developed and tested if an e-mental health programme could reach people affected by someone else's gambling in Germany. A total of 6357 visits to the website were logged. The majority of participants found out about the site through leaflets that were distributed to the public. The average time spent on the site was just over 7 minutes. More than half the visits lasted less than 30 seconds. About 3.5% of the visitors to the site became participants in the e-mental health programme. Of the 126 participants, about one-third completed all modules. One-third of the participants did not finish the programme, and one-third did not start the programme. Two-thirds of participants had not sought professional support or self-help before the programme. Those who started but did not complete the programme reported the highest levels of psychological distress. The results suggest that e-mental health programmes could reach and be helpful for affected family members.