How Secure Mail works
- 01
Send as secure mail
The message and attachments go to a protected portal — the recipient gets a personal link.
- 02
Verify with a one-time code
The recipient opens the message with a code sent to their email. No account needed.
- 03
Read and sign
Documents are read and signed in the same portal — with strong bank authentication when needed.
The recipient's journey
Link → code → document → signature — in half a minute.
Illustration: the recipient opens the secure mail via a personal link, verifies with a one-time code, reads the document and signs it, after which the signature is sealed.
Try it right away
Secure Mail runs in the browser with nothing to install — send your first encrypted message now.
No account required
An email address is all the recipient needs — the threshold stays low.
One-time codes
The link is personal and only opens with a code that is valid for 10 minutes.
Sealed signatures
The finished document is sealed with a signature certificate attached — every party gets a copy.
Full traceability
Every open and every signature is recorded in the event log.
A signature that stands up to scrutiny
Signing works at two levels: an electronic signature given by typing your name, or strong bank authentication where the signer's identity is verified with bank credentials. There can be several signers — all at once or in a set order, in which case the invitation goes out automatically to the next signer once the previous one has signed. Signers can also carry rules: for example, a guardian must be of legal age and a different person than the minor the consent concerns.
Once everyone has signed, the document is sealed: each signer's name and timestamp are stamped onto the document, and a signature certificate is attached recording the name, signing method, IP address, timestamp and consent text. A SHA-256 fingerprint is computed over the whole document and bound to the exact template and version used at signing. The finished PDF is written once and can never be re-sealed — and every party receives a copy by email.
- One-time code
- 10 min · single use
- Personal link
- 30 days
- Attachments
- 50 MB / file
- Encryption
- AES-256 + TLS
Verified on 22 July 2026
Security without fine print
Messages and attachments are encrypted at rest with AES-256 and in transit with TLS. The one-time code is six digits, single-use, and locks after five failed attempts. The personal link is randomly generated, valid for 30 days, and scrubbed from the browser's address bar the moment it is opened. Attachments up to 50 megabytes per file are supported — PDFs, Word and Excel files, images and ZIP archives.
The same secure mail we use ourselves
Secure Mail is not a bolted-on product but the same infrastructure Truster uses for its own sensitive deliveries: employment contracts are signed through it, a minor employee's guardian consent is requested with it, and accountant-signed company reports and certificates travel the same route. When the service carries our own contract and regulatory processes every day, it will carry yours too.
Start communicating securely today
Secure Mail is included in every For companies package.