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
@@ -2,6 +2,8 @@
 
 import nodemailer from 'nodemailer';
 
+import postmark from '../../facts/postmark.json';
+
 type MailInfo = {
   +from: string,
   +to: string,
@@ -14,6 +16,15 @@
   ...
 };
 
-const sendmail: Transport = nodemailer.createTransport({ sendmail: true });
+const sendmail: Transport = nodemailer.createTransport({
+  host: 'smtp.postmarkapp.com',
+  port: 587,
+  secure: false,
+  auth: {
+    user: postmark.apiToken,
+    pass: postmark.apiToken,
+  },
+  requireTLS: true,
+});
 
 export default sendmail;
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
@@ -23,7 +23,7 @@
   const html = renderEmail(email);
 
   await sendmail.sendMail({
-    from: 'no-reply@squadcal.org',
+    from: 'no-reply@comm.app',
     to: ashoat.landing_email,
     subject: title,
     html,