Below are the fingerprints for Fastmail SSL/TLS certificates. They can be useful if you need to confirm that non-browser connections are secure.
All our certificates for the domains listed in the following links are issued by Let's Encrypt or DigiCert.
- Fingerprints in text: https://data.fastmail.com/data/fingerprints/fingerprints.txt
- Fingerprints as JSON: https://data.fastmail.com/data/fingerprints/fingerprints.json
These fingerprints will be automatically updated when certificates are renewed.