NHSmail is compliant with a number of ISO Standards (see table below):
| Accreditation | Certificate Number |
| ISO 9001:2015 | FS 571552 |
| ISO/IEC 20000-1:2011 | ITMS 535634 |
| ISO/IEC 20000-1:2011 | ITMS 571355 |
| ISO 22301:2012 | BCMS 523309 |
| ISO 22301:2012 | BCMS 556058 |
| ISO/IEC 27001:2013 | IS 589293 |
If certificate evidence is required, the BSI Certificate and Client directory can be searched.
