diff --git a/server/config/default.yaml b/server/config/default.yaml
index 7a691032..7c8496a2 100644
--- a/server/config/default.yaml
+++ b/server/config/default.yaml
@@ -217,6 +217,8 @@ builtinZoneMTA:
   redis: redis://localhost:6379/2
   log:
     level: warn
+  processes: 2
+  connections: 5
 
 seleniumWebDriver:
   browser: phantomjs
diff --git a/server/lib/builtin-zone-mta.js b/server/lib/builtin-zone-mta.js
index f007e44a..5214e660 100644
--- a/server/lib/builtin-zone-mta.js
+++ b/server/lib/builtin-zone-mta.js
@@ -108,8 +108,8 @@ async function createConfig() {
             default: {
                 preferIPv6: false,
                 ignoreIPv6: true,
-                processes: 1,
-                connections: 5,
+                processes: config.builtinZoneMTA.processes,
+                connections: config.builtinZoneMTA.connections,
                 pool: 'default'
             }
         }