The list of secure domains includes:
nhs.uk (*not all addresses meet this standard)
In addition, you can use Accumail to contact any *nhs.uk address and certain services from the NHS care providers list that do not meet the NHS Secure Email Standard. Any emails sent to these types of email addresses via Accumail can't be guaranteed as secure, as detailed in this help article. Before sending to one of these addresses, Accumail will present you with a warning that, ‘This is not an NHS Secure Email Standard accredited address’.
It is not possible to use Accumail to email other domains (eg gmail.com), and you will be presented with the message that, 'You can't email this address as it's not secure'.
Note: as Accumail is a two-way level of communication, not only will you be able to send out emails, but your practice will also be able to receive inbound from healthcare professionals and services. They will be able to communicate ad-hoc, specific information about patients, including sharing prescription changes and blood results