PostmarkApp Email Integrator
Enables your WordPress site to send emails via PostMarkApp API.
Use with caution
PostmarkApp Email Integrator works, but test it on a staging site before relying on it in 2026. It runs on 50+ sites, is rated 5/5 and was last updated 7 months ago, and scores 47/100 on our health check.
- Small user base (50+ active installs)
- Very few reviews so far
- Only tested up to WordPress 6.9 (latest is 7.1)
How does it stack up?
Side-by-side on installs, updates, ratings & support
Daily downloads
Download spikes usually follow a new release — each site that auto-updates counts as a download.
Rankings
Where PostmarkApp Email Integrator stands todayWordPress.org search rankings
Live position in the plugin search, top 100| Keyword | Position |
|---|---|
| >100 | |
| Notifications | >100 |
| postmark | #12 |
| smtp | >100 |
| wp_mail | #41 |
Version adoption
Share of active sites per release.
Rating breakdown
★★★★★★★★★★ 5 from 4 reviews
About PostmarkApp Email Integrator
From the official readme · v2.5.0Description
This plugin enables WordPress blogs of any size to deliver and track WordPress notification emails reliably, with minimal setup time and zero maintenance. No more SMTP errors or delivery problems with Postmark!
If you don’t already have a free Postmark account, you can get one in minutes. Every account comes with thousands of free email sends.
PLEASE NOTE: This is not official PostMarkApp Plugin. This plugin is a copy of the Official Postmarkapp plugin which had several critical bugs. The Official Plugin developers have not addressed these bugs for some time now, so I created a new plugin to solve those issues.
Issues fixed(from the official version):
- Fixed the Connection Timeout bug
- Fixed the Fatal Error due to incorrect usage of WP_Error object
- Fixed the issue while parsing the headers sent as array to the wp_mail function
- Fixed the breaking of plaintext when force html option is selected
New Features added:
- Support for adding Cc, Bcc, and Reply-To headers
- Support to filter the arguments by other plugins like its done in the actual wp_mail() function of WordPress
- Auto import settings from the Postmarkapp approved WordPress plugin for easy migration
Roadmap:
- Support for attachments
- Handling special characters in Subject
- Ability for dynamic “From” addresses by verifying from PostmarkApp
To know more about PostMarkApp, please visit this link: http://postmarkapp.com
To get help about PostMarkApp, please visit this link: http://support.postmarkapp.com/
To contribute to this plugin, visit the GitHub repository: https://github.com/gagan0123/postmarkapp-email-integrator
Installation
- Upload postmark directory to your /wp-content/plugins directory
- Activate plugin in WordPress admin
- In WordPress admin, go to Settings then Postmarkapp. You will then want to insert your Postmark details. If you don’t already have a Postmark account, get one at http://postmarkapp.com
- Verify sending by entering a recipient email address you have access to and pressing the “Send Test Email” button.
- Once verified, then check “Enable” to override wp_mail and send using Postmark instead.
Frequently asked questions
What is Postmark?
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?
This 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.
Does this cost me money?
This Postmark plugin is 100% free. All new Postmark accounts include thousands of free email sends. Beyond your first free email sends, they will cost only $1.50 per 1000 sends with no monthly commitments and no expirations. Postmark will send you multiple warnings as you approach running out of send credits, so you don’t need to worry about paying for credits until you absolutely need them. Sign up for your free Postmark account at http://postmarkapp.com and get started now.
Changelog
v2.5.0
- Security: Fixed Stored Cross-Site Scripting (XSS) vulnerability in plugin settings (CVE-2026-1043)
- Security: Added output escaping with esc_attr() on all form field values
- Security: Added input sanitization with sanitize_text_field() and sanitize_email()
- Security: Added nonce verification for settings form and AJAX requests
- Security: Added capability checks for form processing and AJAX handlers
- Security: Moved inline JavaScript to external file with proper enqueuing
- Security: Changed API endpoint from HTTP to HTTPS
- Improvement: Added text domain for internationalization support
- Improvement: Replaced extract() usage per WordPress coding standards
- Bug fix: Removed erroneous recursive wp_mail() call in error handling
- Bug fix: Used wp_json_encode() instead of json_encode()
- Bug fix: Used wp_die() instead of die() in AJAX handlers
- Dev: Added PHPCS configuration for WordPress coding standards
- Dev: Added Lando configuration for local development
- Dev: Added build script for WordPress.org distribution
v2.4.0
- Added filter as defined in the wp_mail function so as to minimize conflict with other plugins.
v2.3.0
- Allow multiple Bcc & Cc in headers that are not comma separated.
- Fixed casing issues in the headers caused when some plugin/code uses lower casing for headers.
v2.2.0
- Added better $var validation using isset to prevent ‘Notice: Undefined’ when WP_debug is activated.
v2.1.0
- Fixed the breaking of plaintext when force html option is selected
v2.0.0
- Error handling done through WP_Error object
- Made the “Test Email” error messages more descriptive by showing actual PostMarkApp messages
- Added support for Bcc header
- Added support for Cc header
- Added support for Reply-To header
- Removed “Powered by PostMark” append in the emails
For developers
Is this your plugin? Show off the numbers.
Add a live badge to your site, docs or GitHub README. It updates on its own — no account needed.
Best PostmarkApp Email Integrator alternatives
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FAQ
PostmarkApp Email Integrator: quick answers
Straight answers, pulled from live WordPress.org data.
Live data from WordPress.org · checked Oct 20, 2026
Is PostmarkApp Email Integrator free?
Yes. PostmarkApp Email Integrator is free to download and use from the official WordPress.org plugin directory.
Is PostmarkApp Email Integrator safe to use in 2026?
PostmarkApp Email Integrator works, but test it on a staging site before relying on it in 2026. It runs on 50+ sites, is rated 5/5 and was last updated 7 months ago, and scores 47/100 on our health check.
How many websites use PostmarkApp Email Integrator?
PostmarkApp Email Integrator is active on 50+ WordPress websites and has been downloaded 3,368 times since it launched in September 2014. It was downloaded 136 times in the last 30 days.
Does PostmarkApp Email Integrator work with WordPress 7.1?
PostmarkApp Email Integrator is officially tested up to WordPress 6.9.10, while the latest release is 7.1.3. It may still work, but try it on a staging site first.
When was PostmarkApp Email Integrator last updated?
The latest version, 2.5.0, was released on March 23, 2026 (7 months ago).
Who makes PostmarkApp Email Integrator?
PostmarkApp Email Integrator is developed and maintained by Gagan Deep Singh.
What are the best alternatives to PostmarkApp Email Integrator?
The most popular alternatives to PostmarkApp Email Integrator are WP Mail SMTP by WPForms (4M+ installs), MC4WP: Mailchimp for WordPr… (1M+ installs) and Easy WP SMTP (500K+ installs).
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