fix(email): parse sender hostname from application URL (#1518)

server/lib/email/index.ts

@@ -1,11 +1,15 @@
 import Email from 'email-templates';
 import nodemailer from 'nodemailer';
-import { NotificationAgentEmail } from '../settings';
+import { URL } from 'url';
+import { getSettings, NotificationAgentEmail } from '../settings';
 import { openpgpEncrypt } from './openpgpEncrypt';
 
 class PreparedEmail extends Email {
   public constructor(settings: NotificationAgentEmail, pgpKey?: string) {
+    const { applicationUrl } = getSettings().main;
+
     const transport = nodemailer.createTransport({
+      name: applicationUrl ? new URL(applicationUrl).hostname : undefined,
       host: settings.options.smtpHost,
       port: settings.options.smtpPort,
       secure: settings.options.secure,