diff --git a/keyserver/src/emails/sendmail.js b/keyserver/src/emails/sendmail.js
--- a/keyserver/src/emails/sendmail.js
+++ b/keyserver/src/emails/sendmail.js
@@ -1,7 +1,12 @@
 // @flow
 
+import invariant from 'invariant';
 import nodemailer from 'nodemailer';
 
+import { isDev } from 'lib/utils/dev-utils';
+
+import { importJSON } from '../utils/import-json.js';
+
 type MailInfo = {
   +from: string,
   +to: string,
@@ -14,6 +19,37 @@
   ...
 };
 
-const sendmail: Transport = nodemailer.createTransport({ sendmail: true });
+type PostmarkConfig = {
+  +apiToken: string,
+};
+
+let cachedTransport: ?Transport;
+async function getSendmail(): Promise<Transport> {
+  if (cachedTransport) {
+    return cachedTransport;
+  }
+  const postmark: ?PostmarkConfig = await importJSON({
+    folder: 'facts',
+    name: 'postmark',
+  });
+
+  if (isDev && !postmark) {
+    cachedTransport = nodemailer.createTransport({ sendmail: true });
+    return cachedTransport;
+  }
+
+  invariant(postmark, 'Postmark config missing');
+  cachedTransport = nodemailer.createTransport({
+    host: 'smtp.postmarkapp.com',
+    port: 587,
+    secure: false,
+    auth: {
+      user: postmark.apiToken,
+      pass: postmark.apiToken,
+    },
+    requireTLS: true,
+  });
+  return cachedTransport;
+}
 
-export default sendmail;
+export default getSendmail;
diff --git a/keyserver/src/emails/subscribe-email-updates.js b/keyserver/src/emails/subscribe-email-updates.js
--- a/keyserver/src/emails/subscribe-email-updates.js
+++ b/keyserver/src/emails/subscribe-email-updates.js
@@ -6,7 +6,7 @@
 import ashoat from 'lib/facts/ashoat';
 import type { EmailSubscriptionRequest } from 'lib/types/account-types';
 
-import sendmail from './sendmail';
+import getSendmail from './sendmail';
 import Template from './template.react';
 
 async function sendEmailSubscriptionRequestToAshoat(
@@ -22,8 +22,9 @@
   );
   const html = renderEmail(email);
 
+  const sendmail = await getSendmail();
   await sendmail.sendMail({
-    from: 'no-reply@squadcal.org',
+    from: 'no-reply@comm.app',
     to: ashoat.landing_email,
     subject: title,
     html,