diff --git a/server/lib/mailers.js b/server/lib/mailers.js
index ac81a040..7880ce1a 100644
--- a/server/lib/mailers.js
+++ b/server/lib/mailers.js
@@ -173,7 +173,7 @@ async function _createTransport(sendConfiguration) {
             }
         };
 
-        if (mailerType === MailerType.ZONE_MTA && mailerSettings.zoneMTAType === ZoneMTAType.BUILTIN) {
+        if (mailerType === MailerType.ZONE_MTA && mailerSettings.zoneMtaType === ZoneMTAType.BUILTIN) {
             transportOptions.host = config.builtinZoneMTA.host;
             transportOptions.port = config.builtinZoneMTA.port;
             transportOptions.secure = false;