RelayBridge Gives Old Printers a Modern Microsoft 365 Exit

Field notes

The documented sequence is device SMTP submission, local acceptance and durable queuing, then direct delivery to Exchange Online through TLS and certificate-based OAuth. RelayBridge’s stated design keeps the mail path on the operator’s network and identifies no product cloud, hosted mailbox, or client secret. Exchange Application RBAC is presented as the mechanism for narrowing authorization to an approved sender. The project is still preparing its v1.0 release, with application source publication tied to that release.