CleverTap supports sending emails through Postmark.

Step 1: Integrating Postmark with CleverTap

  • In the dashboard, navigate to Settings and click on Integrate Email.
  • Select Postmark.
  • Host value should be
  • Port value should be 587.
  • Postmark API key value is your Postmark API key.
  • From Address – this value is used as the sender email address. Most people will not open an email unless they recognize the sender.
  • Save your settings.
  • Finally, click Send a test email and fill in your details to test the configuration details you entered. Has it arrived in your inbox? If not, see troubleshooting steps below.

Step 2: Bounces, Rejections, and Unsubscriptions

When an email is classified as bounced, rejected or when a user unsubscribes, CleverTap needs to be notified so that no further deliveries to that mailbox are attempted. This is considered a good practice and helps improve your sender reputation. Good sender reputation virtually guarantees better delivery rates.

To enable bounce handling, please follow Postmark guide. You’ll need to specify a CleverTap callback URL in your Postmark account settings page.

To enable support for bounce processing, follow the steps below:

  • Navigate to Your Server → Settings → Outbound.
  • As shown in the image below, in the Bounce Webhook input box, add the Callback URL as shown in your CleverTap Email Settings page.
  • Save your settings.

Configure Bounce Webhooks for Email


  • When an email bounces, drops or unsubscribes, CleverTap will mark the user’s email address as inactive.
  • The count of email bounces is shown on the email report screen.

Step 3: Troubleshooting

Check your SPAM folder to see if the message has been classified as SPAM by your email provider.