[Secure Border Gateway (SBG)](https://element.io/en/server-suite/secure-border-gateways)
Spawning from [internal
discussion](https://matrix.to/#/!mNoPShRlwEeyHAEJOe:element.io/$6eGip85OUKOmyK1VzqrFMc7eF7dON7Vs76O40kVbRRY?via=banzan.uk&via=element.io&via=jki.re)
around integrating [Synapse Pro for small
hosts](https://docs.element.io/latest/element-server-suite-pro/synapse-pro-for-small-hosts/overview)
in the [Element Server Suite (ESS)](https://element.io/en/server-suite)
stack and wanting it be compatible with the SBG.
We know that the SBG works with monolith Synapse because that's what we
have configured with the [Complement tests in the SBG
repo](b76b05b53e/complement/configure_synapse_for_sbg.sh (L8-L10)).
Configuration
This section contains information on tweaking Synapse via the various options in the configuration file. A configuration file should have been generated when you installed Synapse.