Trust center
Letro’s security, privacy and compliance documents in one place
Whether you need a standard rollout, private infrastructure, or stricter residency and isolation requirements, Letro gives you a verified, evidential foundation for secure client communication.
What we publish
7 documents
01+Security overviewLetro is built as a Proof-of-Service / Digital Registered Delivery platform.
02+Encryption modelMatrix end-to-end encryption with Olm/Megolm, TLS 1.3 transport, device verification, and what the homeserver can and cannot see.
03+Encryption & auditabilityLetro is encrypted and evidential. Here is how those two properties fit together.
04+Data residency & infrastructureWhere Letro data lives, who operates it, and how each deployment tier changes the answer.
05+Incident response outlineHow Letro detects, contains and resolves security incidents, and how customers are notified.
06+Subprocessors listThe third parties that process data for the Letro platform, website and sales process: who they are, what they handle, where, and under which safeguard.
07+Vulnerability disclosure policyHow to report a security vulnerability in letro.com or the Letro applications, and what you can expect from us.
LetroOctober 2026
Mobile app penetration test
An independent penetration test of the Letro mobile app by ImmuniWeb (MobileSuite) was completed on 16 October 2026. The report is available to customers under NDA.
Assessor: ImmuniWebRequest the report
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