Letro Tech GmbH

Letro is an ultra secure communications platform purpose-built for regulated professionals and industries. The goal is to connect clients and companies in a secure channel, replacing letters and complementing email. Built on the open-source Matrix protocol with end-to-end encryption, Letro provides a sovereign data residency, auditable communication and document exchange environment aligned with FinSA, FINMA Circular 2025/2, and DORA requirements. Every user is verified through PostNumber, Letro's proprietary identity system, combining passport scan, address confirmation, and biometric identification.