Description
Mailster manages email marketing campaigns directly from the WordPress dashboard, building newsletters in a visual drag-and-drop editor and sending them via SMTP, Amazon SES, SendGrid, or an internal cron. It’s built for people who publish recurring content on blogs, niche sites, and news portals and prefer to keep subscriber lists, campaign creation, and open reports centralized in the same WordPress install, without relying on an external platform.
Key Features of Mailster
- Visual drag-and-drop editor
Build the email layout by dragging text, image, button, and divider blocks. - List and subscriber management
Register, segment, and import subscribers into lists with custom fields. - Built-in signup forms
Generate capture forms to embed in site pages, posts, and widgets. - Sending via multiple methods
Supports SMTP, Amazon SES, SendGrid, and other email delivery services. - Real-time campaign reports
Track open rates, clicks, bounces, and unsubscribes right from the dashboard.
Benefits of Mailster
- Independence from external platforms
Eliminates third-party service subscription fees by keeping the list and sending inside the site. - Short learning curve
The visual editor lets you build emails without HTML or CSS knowledge. - Scalability through your own infrastructure
Connects to bulk sending services to reach large lists with good deliverability. - Data-driven decisions
Open and click metrics show which subjects and content engage the most.
Who Is Mailster For?
- Anyone running a blog, digital magazine, or news portal who wants to send periodic roundups to their reader base.
- You, if you already have a subscriber list and want to move sending inside WordPress itself.
- Content creators, info-product sellers, and authors who need to nurture an audience without hiring an external email marketing platform.
- Anyone working in specific niches (courses, communities, ecommerce) who wants to segment campaigns by interest or behavior.
How to Download Mailster
Mailster is available for download here on Ultrapack. After downloading the .zip file, install it via Plugins > Add New > Upload Plugin, select the file, and activate it. Once activation is complete, a new Newsletter menu appears in the WordPress dashboard, where you configure the sending method, create lists, and build your first campaigns.
Centralizing email marketing operations in the same WordPress install avoids constantly syncing lists with external services and removes the variable monthly fee that scales with your list size. Anyone already producing content on their site gets a direct flow: publish, segment the list, and send the campaign without leaving the admin, with reports on the same screen where you edit posts.
Frequently asked questions
Is Mailster – Email Newsletter Plugin GPL-licensed?
Yes. Mailster – Email Newsletter Plugin is distributed under the GPL (GNU General Public License). You may legally use, modify and redistribute it on as many sites as you want.
Can I use Mailster – Email Newsletter Plugin on multiple sites?
Yes. You can use Mailster – Email Newsletter Plugin on multiple sites. The number of sites connected to Ultrapack Auto Updater is limited by your plan.
How much does Mailster – Email Newsletter Plugin cost at Ultrapack?
Mailster – Email Newsletter Plugin costs US$2.99 as a single purchase, and it is also included in the subscription plans starting at US$12/mo (VIP I).
Does Mailster – Email Newsletter Plugin include updates?
Yes. The current version of Mailster – Email Newsletter Plugin is 4.1.19, published at Ultrapack on Sep 23, 2026. Subscribers update straight from the WordPress dashboard with UAU (Ultrapack Auto Updater).
Is Mailster – Email Newsletter Plugin scanned before publication?
Yes. Every version of Mailster – Email Newsletter Plugin goes through a malware scan (ClamAV and YARA rules, at UltraHub) before it is published.
What are the requirements for the plugin Mailster – Email Newsletter Plugin?
Requires WordPress 6.2 or higher and PHP 7.4 or higher. Tested up to WordPress 7.0.
What changed in this version
Version 4.1.19
- fixed: date and anniversary workflow triggers now apply custom-field offset when matching subscribers
- fixed: block form preview no longer allows unauthenticated SQL injection via mailster-block-preview
- fixed: campaign builder module titles and content with UTF-8 characters
- fixed: subscriber export download now requires export capability and rejects unsafe filenames
- fixed: template delete no longer allows path traversal outside the templates directory
- fixed: block form placement preview scrolling no longer fails across origins
- updated: dependencies
Version 4.1.18
- fixed: template save and ZIP upload AJAX endpoints now block path traversal and unsafe file types
- fixed: block form REST submissions no longer accept certain subscriber fields
- improved: anti-flood protection now uses the direct client IP instead of forwarded headers
- updated: dependencies
Version 4.1.17
- This update brings stability and improvements for WordPress 7.0.
- improved: block forms now support block gaps.
- improved: block form message now visible in the editor.
- improved: block form message now supports borders and shadows.
- improved: buttons on campaign edit screen for WordPress 7.0.
- improved: visual fixes for WordPress 7.0.
- improved: Quickly copy Block Markup for block forms (next to short codes).
- improved: sanitize URLs using esc_url for improved security.
- updated: included form patterns for WordPress 7.0.
- updated: validate form ID by ensuring it is numeric before processing in frontpage class
- updated: replace ButtonGroup with Flex component in FormSelector and EmailSelector for improved layout consistency
- updated: included form patterns for WordPress 7.0.
- removed: clean lists note on import screen.
- removed: deprecated `utf8_*` methods.
- fixed: missing conditions error on manage subscribers screen.
- fixed: missing colors on forms if block messages have a non-default color.
- fixed: form section in form blocks now displays all available forms when there are more than 10.
- updated: dependencies
Version 4.1.16
- removed: eliminate remove_template method from MailsterAjax class to streamline AJAX functionality
- fixed: broken blocks on automation by adding `sprintf` function to i18n imports for better string formatting in multiple files
- improved: ensure only the latest export file is downloadable by validating the filename against stored option
- improved: modify MIME type for zip uploads and enable type testing in MailsterAjax class
Version 4.1.15
- fixed: correct logic in URL validation check
- fixed: check if campaign is in a valid status before checking the content
- refactored: streamline form retrieval and fallback logic in MailsterNotification class for improved readability and maintainability
- updated: bump dependencies and lock files to latest versions for improved compatibility and performance
- updated: enhance URL validation logic in MailsterFrontpage class to include campaign status checks and improve error handling
- updated: add __next40pxDefaultSize prop to various components for consistent styling across form elements
Release notes published by the developer.
How to install
Automatic updates: this item is updated by the Ultrapack Auto Updater. With it installed, the new version shows up in your dashboard like any other WordPress update (how to set it up).
- Download the file
codecanyon-3078294-mailster-email-newsletter-plugin-for-wordpress-wordpress-plugin.zip. - In the WordPress dashboard, go to Plugins > Add New > Upload Plugin.
- Select the file
codecanyon-3078294-mailster-email-newsletter-plugin-for-wordpress-wordpress-plugin.zipand click Install Now. - Click Activate.
Requirements: Requires WordPress 6.2 or higher and PHP 7.4 or higher. Tested up to WordPress 7.0.
Stuck on a step? Open a ticket telling us which one you stopped at.

UAU Ready