The current version of Matrix-EmailBridge uses an very old version (v 0.1.0 beta.2 versus current v.0.8.0) of mautrix-go lib (https://github.com/tulir/mautrix-go, listed as maunium.net/go/mautrix in the code). As such, the code compiles but doesn't actually work on a the current matrix synapse server (v 1.25). Best fix is to update the code of this project to make it compatible with the current version of mautrix-go lib.
The current version of Matrix-EmailBridge uses an very old version (v 0.1.0 beta.2 versus current v.0.8.0) of mautrix-go lib (https://github.com/tulir/mautrix-go, listed as maunium.net/go/mautrix in the code). As such, the code compiles but doesn't actually work on a the current matrix synapse server (v 1.25). Best fix is to update the code of this project to make it compatible with the current version of mautrix-go lib.