This guide was created to solve TLS certificate verification issues when installing Poste.io on Dokploy, using Traefik as the reverse proxy.
The goal is to prevent conflicts between Traefik and Poste.io during certificate validation and ensure that all mail services (SMTP, IMAP, POP3) work correctly with valid TLS certificates — not just the web UI.
Before going any further, I want to be very clear: this solution is not originally mine.