The PostMark Delivery Addon is a premium extension for “The Newsletter Plugin” (one of the most popular WordPress email marketing tools). It is designed to replace your web server’s default (and often unreliable) wp_mail() function with Postmark’s high-deliverability infrastructure.
This is EXACTLY the same product as distributed by the developer. Sales Page
| Feature | Details |
| Current Version | 1.1.2 (Updated Feb 2026) |
| WordPress Compatibility | Tested up to WP 6.9.4+ (Requires WP 6.1 minimum) |
| PHP Requirement | PHP 7.0 or higher |
| Integration Method | Secure HTTP REST API (Postmark API) |
| Licensing | Typically included in “Professional” or “Agency” plans |
Turbo Send Option: This is a standout feature that enables concurrent sending. You can select between 2 to 10 mail processors to increase delivery speed by up to 10x, provided your hosting environment supports multiple concurrent connections.
Automated Bounce & Complaint Handling: The addon automatically sets up a webhook with Postmark. When an email bounces or a complaint is filed, Postmark notifies your WordPress site, and the plugin automatically marks that subscriber as “Bounced” or “Unsubscribed” to protect your sender reputation.
Real-time Analytics: It bridges Postmark’s delivery data directly into your WordPress dashboard, showing successful deliveries, opens, and clicks.
Support for Multiple Streams: While Postmark is famous for transactional emails, this addon specifically supports Postmark Broadcast Streams, which are required for bulk newsletters.
Security: Uses API Tokens instead of SMTP credentials, which is generally more secure and less prone to port blocking by hosting providers.
To use this addon, you must have the following prepared:
Postmark Account: An active account with a created “Server.”
Validated Sender: A verified “From” email address or an authenticated domain (DKIM/SPF) within the Postmark console.
API Token: Located in your Postmark console under Servers > [Your Server] > API Tokens.
The Newsletter Plugin: The core (free) version must be installed first.
Marketing vs. Transactional: Postmark has strict rules. You must ensure you are using a Broadcast Stream for newsletters. Using a Transactional Stream for bulk marketing can lead to account suspension.
Initial Test Mode: If your Postmark account is brand new and hasn’t been “approved” yet, you can only send test emails to your own domain.
