Peripartum mental disorders are highly prevalent conditions and associated with adverse outcomes for the mother, the infant and the whole family. Despite the high burden, help-seeking is low. E-mental health interventions could overcome help-seeking barriers and thus improve perinatal mental health. However, usage and adherence are rather low. This study aims to assess attitudes and needs of different stakeholder groups and to identify relevant topics to develop an intervention meeting the needs of pregnant and postpartum women and thus, increasing utilization and adherence. Therefore, semi-structured interviews and focus groups with pregnant women (n = 3), mothers (n = 4), women who have suffered from a postpartum mood disorder in the past (n = 5), gynaecologists (n = 5), and midwives (n = 5) were conducted. All interviews were audio-recorded, transcribed verbatim, and analyzed using a thematic analysis. Almost half of the stakeholders reported previous experiences with e-mental health services. Anonymity, flexibility, promoting help-seeking, or bridging waiting-time for treatment as usual were regarded as the main benefits. Concerns regarding the usefulness of e-mental health interventions, absence of face-to-face contact or lack of integration into routine care were considered as barriers. With regard to the desired program content, six main topics were identified: pregnancy and puerperium, peripartum mood swings and disorders, support options, self-care, partnership, and fatherhood. Regarding preferred characteristics of e-mental health programs, stakeholders mentioned customizability, individual guidance, evaluation of user-feedback and continuous adoption, as well as a responsive and user-friendly design. Overall, online interventions for perinatal mental health were mainly considered as beneficial. Stakeholders underlined the high need for education regarding the use and effectiveness of e-mental health, to overcome concerns and obstacles and improve acceptability. Furthermore, developing customizable and individually-guided interventions were considered as promising to increase utilization of and adherence to e-mental health interventions.