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The edge MTAs present certificates from the internal Vault PKI, so the smarthost cannot verify mta1/mta2.edge.unkin.net against the system CA bundle. - pin both edge relay TLS policies to the internal CA via `tafile=` - mount `vault-ca-cert` into the smarthost pods and reload on change --------- Co-authored-by: BenVincent <benvin@main.unkin.net> Reviewed-on: #548 Co-authored-by: unkin-agent <unkin-agent@unkin.net> Co-committed-by: unkin-agent <unkin-agent@unkin.net>