settings: move mailFqdn/Domain into mailServer

src/cloudron.js

@@ -32,6 +32,7 @@ const apps = require('./apps.js'),
     dns = require('./dns.js'),
     dockerProxy = require('./dockerproxy.js'),
     eventlog = require('./eventlog.js'),
+    mailServer = require('./mailserver.js'),
     moment = require('moment-timezone'),
     network = require('./network.js'),
     oidc = require('./oidc.js'),
@@ -141,7 +142,7 @@ async function getConfig() {
         consoleServerOrigin: await appstore.getConsoleServerOrigin(),
         adminDomain: settings.dashboardDomain(),
         adminFqdn: settings.dashboardFqdn(),
-        mailFqdn: settings.mailFqdn(),
+        mailFqdn: await mailServer.getLocation().fqdn,
         version: constants.VERSION,
         ubuntuVersion,
         isDemo: constants.DEMO,