The severity and extension of the COVID-19 pandemic and the social and economic consequences of the measures taken to control it impacted the mental health of many people. Between March and May 2020, the Ministry of Health and the General Council of Psychology of Spain launched the Psychological First Aid Service (Servicio de Primera Ayuda Psicológica or SPAP), a national helpline designed to provide early psychological care to people affected by COVID-19. This service attended more than 15,000 calls and carried out more than 11,000 interventions and 9,500 follow-ups with the general population, healthcare and other essential professionals and the patients and relatives of the sick or deceased. This oral communication presents the results of the SPAP regarding the sociodemographic characteristics and psychological problems of the people served and the follow-up of these problems one and a half years after the end of the SPAP. It also discusses the lessons learned from the analysis of the SPAP's activities and results, which should be taken into account when planning the necessary measures to prepare countries for the psychological impact of future pandemics and other large-scale disasters.