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NHSmail APIs Acceptable Use

Acceptable use of NHSmail APIs

The NHSmail platform and APIs have a number of safeguards to protect against inappropriate use; however, NHS Digital would still like to encourage appropriate use of the NHSmail APIs. The APIs have rate limiting controls that will prevent inappropriate use. The NHSmail management team reserves the right to restrict users’ access to specific APIs if they are being utilised in a way that is impacting performance of the platform.

System updates & changes

Updates to the NHSmail system will occur as needed and not on a set schedule. Forewarning of these changes will be posted onto the NHSmail service status pages.


NHS Digital does not provide an environment for development testing. It is the responsibility of the developer to perform testing. The production NHSmail system must not be used for development testing. All developers are advised to create their own safe environment for application testing and to use an iterative approach for development.

Further guidance and contact information

If you are intending to create an app to connect with NHSmail, please contact us at