add email sender

lib/services/mailer.service.ts

@@ -52,7 +52,13 @@ export const sendEmail = enhanceAction(
     const mailer = await getMailer();
     const log = await getLogger();
 
+    if (!process.env.EMAIL_USER) {
+      log.error('Sending email failed, as no sender found in env.')
+      throw new Error('No email user configured');
+    }
+
     const result = await mailer.sendEmail({
+      from: process.env.EMAIL_USER,
       to,
       subject,
       html,