The Australian Digital Health Agency invites industry providers delivering secure messaging, clinical information system / applications suppliers and end users to collaborate with the Agency on national implementation projects. The projects will prove the concept and demonstrate a working model for three key use cases to progress the adoption of secure messaging capabilities across the health sector in Australia. Suppliers and partners will need to establish and work within a consortium to deliver secure messaging capabilities across different healthcare settings. The Agency has prioritised secure messaging as a core foundational capability required to enable interoperability between two or more messaging suppliers and seamless, secure, and confidential information sharing across all health care providers and consumers. The Agency anticipates its total investment through these Request for Tenders to be less than $1M. We hope to see consortia outlining in-kind contributions alongside Agency investment to achieve outcomes that align to the strategic priorities of industry participants and quality improvement goals of healthcare organisations.