diff --git a/secrets/matrix-email-config.nix b/secrets/matrix-email-config.nix
index ef7eed8..dcdbb06 100644
Binary files a/secrets/matrix-email-config.nix and b/secrets/matrix-email-config.nix differ
diff --git a/services/matrix.nix b/services/matrix.nix
index 228cabf..7a7b223 100644
--- a/services/matrix.nix
+++ b/services/matrix.nix
@@ -39,6 +39,12 @@ in {
           smtpPort = mkOption {
             type = types.port;
             default = 587;
+            description = ''
+              The port to use to connect to the SMTP host.
+
+              Defaulting to STARTTLS port 587 because TLS port 465 isn't supported by synapse
+              See https://github.com/matrix-org/synapse/issues/8046
+            '';
           };
           smtpUser = mkOption {
             type = types.str;