services: simplify startup logic

src/mail.js

@@ -28,7 +28,7 @@ exports = module.exports = {
     setMailEnabled,
     setBanner,
 
-    startMail: restartMail,
+    startMail,
     restartMail,
     handleCertChanged,
     getMailAuth,
@@ -746,6 +746,12 @@ async function restartMail() {
     await configureMail(settings.mailFqdn(), settings.dashboardDomain(), mailConfig);
 }
 
+async function startMail(existingInfra) {
+    assert.strictEqual(typeof existingInfra, 'object');
+
+    await restartMail();
+}
+
 async function restartMailIfActivated() {
     const activated = await users.isActivated();