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ActiveCampaign Postmark for WordPress

by Andrew Yates & Matt Gibbs.

The officially-supported ActiveCampaign Postmark plugin for Wordpress.

4.7 Avg. Rating
30K Installs
Tested with WordPress 6.0.2

If you’re still sending email with default SMTP, you’re blind to delivery problems! ActiveCampaign Postmark for WordPress enables sites of any size to deliver and track WordPress notification emails reliably, with minimal setup time and zero maintenance.

If you don’t already have an ActiveCampaign Postmark account, you can get one in minutes, sign up at

Check out our video on how to set up the ActiveCampaign Postmark for WordPress plugin here.

Additional Resources

ActiveCampaign Postmark for WordPress FAQ

Can I use the ActiveCampaign Postmark for WordPress plugin with Gravity Forms?

How do I send with Ninja Forms and ActiveCampaign Postmark for WordPress?

How do I send with Contact Form 7 and ActiveCampaign Postmark for WordPress?

Can I use the ActiveCampaign Postmark for WordPress plugin with Divi contact forms?

  1. Upload postmark directory to your /wp-content/plugins directory
  2. Activate plugin in WordPress admin
  3. In WordPress admin, go to Settings then Postmark. You will then want to insert your Postmark details. If you don’t already have a Postmark account, get one at
  4. Verify sending by entering a recipient email address you have access to and pressing the “Send Test Email” button.
  5. Once verified, then check “Enable” to override wp_mail and send using the Postmark API instead.

What is ActiveCampaign Postmark?

ActiveCampaign Postmark is a hosted service that expertly handles all delivery of transactional webapp and web site email. This includes welcome emails, password resets, comment notifications, and more. If you’ve ever installed WordPress and had issues with PHP’s mail() function not working right, or your WordPress install sends comment notifications or password resets to spam, Postmark makes all of these problems vanish in seconds. Without Postmark, you may not even know you’re having delivery problems. Find out in seconds by installing and configuring this plugin.

Will this plugin work with my WordPress site?

The ActiveCampaign Postmark for WordPress plugin overrides any usage of the wp_mail() function. Because of this, if any 3rd party code or plugins send mail directly using the PHP mail function, or any other method, we cannot override it. Please contact the makers of any offending plugins and let them know that they should use wp_mail() instead of unsupported mailing functions.

TLS Version Requirements/Compatibility

The ActiveCampaign Postmark API requires TLS v1.1 or v1.2 support. We recommend using TLS v1.2.

You can check your TLS v1.2 compatibility using this plugin. After installing the plugin, change the dropdown for ‘Select API Endpoint’ to How’s My SSL? and run the test. If compatibility with TLS v1.2 is not detected, contact your server host or make the necessary upgrades to support TLS v1.1 or v1.2.

TLS 1.2 requires:

  • PHP 5.5.19 or higher
  • cURL 7.34.0 or higher
  • OpenSSL 1.0.1 or higher

Does this cost me money?

The ActiveCampaign Postmark service (and this plugin) are free to get started. You can sign up at When you need to process more email, ActiveCampaign Postmark offers monthly plans to fit your needs.

My emails are still not sending, or they are going to spam! HELP!?

No worries, our expert team can help. Just send an email to or tweet @postmarkapp for help. Be sure to include as much detail as possible.

Why should I trust you with my email sending?

Because we’ve been in this business for many years. We’ve been running an email marketing service, Newsberry, for five years. Through trial and error we already know what it takes to manage a large volume of email. We handle things like whitelisting, ISP throttling, reverse DNS, feedback loops, content scanning, and delivery monitoring to ensure your emails get to the inbox.

Most importantly, a great product requires great support and even better education. Our team is spread out across six time zones to offer fast support on everything from using Postmark to best practices on content and user engagement. A solid infrastructure only goes so far, that’s why improving our customer’s sending practices helps achieve incredible results

Why aren’t my HTML emails being sent?

This plugin detects HTML by checking the headers sent by other WordPress plugins. If a “text/html” content type isn’t set then this plugin won’t send the HTML to Postmark to be sent out only the plain text version of the email.

How do I set environment specific Postmark plugin settings?

You can optionally set the Postmark API Token, message stream, and default sending address by adding the following to your wp-config.php file:


define( ‘POSTMARK_API_KEY’, ” );
define( ‘POSTMARK_STREAM_NAME’, ‘stream-name’ );

Setting any of these here will override what is set via the plugin’s UI.

Why are password reset links not showing in emails sent with this plugin?

There are a couple ways to resolve this issue.

  1. Open the Postmark plugin settings and uncheck Force HTML and click Save Changes. If the default WordPress password reset email is sent in Plain Text format, the link will render as expected.

  2. Access your WordPress site directory and open the wp-login.php file.

Change this line:

    $message .= ‘<‘ . network_site_url(“wp-login.php?action=rp&key=$key&login=” . rawurlencode($user_login), ‘login’) . “>rn”;

Remove the brackets, so it becomes:

    $message .= network_site_url(“wp-login.php?action=rp&key=$key&login=” . rawurlencode($user_login), ‘login’) . “rn”;

And save the changes to the file.

How do I set the from name?

The plugin supports using the wp_mail_from_name filter for manually setting a name in the From header.


  • Fix Site Health constants usage.

See the previous changelogs here