Mailster WordPress Newsletter Plugin

How well this listing is tuned to rank in WordPress.org search, on the factors an owner controls. Not popularity, optimization.

Directory rank vs rivals

wp.org popularity rank over time · higher is better · when a rival's line climbs above yours, they've overtaken you

How often this plugin actually ships. A steady rhythm is the maintenance signal a single "last updated" date can't show.

Share of active installs on each version of this plugin · 73% run the current release. Green is the current release; a big slice on older versions is a user base that has stopped updating.

Refined from the date this plugin crossed into its current band.

No paid tier is visible, so we don't put a figure on revenue or sale value: that would be guessing. The install base is a real asset to an acquirer, just not one public data lets us price. A small install base leaves thin data to model from.

1. ★★★★★ ksaltik

   7mo ago

   Is this plugin supported or developed .

   Read on wp.org ↗
2. ★★★★★ ninjaneen

   11mo ago

   I don’t often take the time to write a review but the “support” for this plugin is absolutely abysmal. The last FOUR WEEKS of trying to switch from legacy Mailster to new forms has been excruciating. It’s been a complete waste of my time as a developer and a complete waste of my client’s budget, having me liase all this time only to have to give up because ‘support’ won’t help. Firstly the ‘legacy’ forms were hacked and they were being used to send spam, so the hosting company took the website offline until the issue was sorted. I completely removed the legacy form, got the website back online, and then tried to switch to their new forms….. and then the fun really started! Their documentation is awful. It’s not even basic. So I kept having to reach out to ask one excruciating question after the next, one question a day, one answer a day. The days and weeks dragged by and we still can’t create a ‘Mailster Homepage’ which is the new feature that replaced the ‘legacy’ feature. This newsletter was used on a large health organisation website which is funded by the EU. Of course we’re not going to grant 3rd party access to a live website so that can start testing. ONE MONTH LATER and the issues are still not resolved, because ‘support’ have said that they won’t help. The reason? We don’t have a license for the staging/development site which they can use to troubleshoot the issue. We have now moved to a popular 3rd party solution because this last issue was really just the last straw. When the plugin was still working it would take an entire TWO DAYS just to send ONE newsletter to a small list of 2400 subscribers, even after using their ‘intelligent email throttling” or whatever fancy name they give for a tool that makes no difference at all. We’re not on cheap hosting either. We have dedicated CPU and processors. Don’t waste your time with this plugin.

   Read on wp.org ↗
3. ★★★★★ emma336

   3.2y ago

   What a nightmare of a plugin. There are virtually no instructions on how to set it up, it’s unreliable and has lots of bugs. We had an issue with it trying to send hundreds of emails without knowing why it was doing it and there’s no way of knowing how to solve the issues.

   Read on wp.org ↗
4. ★★★★★ Patryk

   3.5y ago

   I’ve been using the plugin for 2 years, it works averagely. Since then they’ve only introduced up to 3 automations, which rarely work. It still doesn’t load blocks and constantly displays error messages. The worst-optimized newsletter plugin. Considering autoresponders, I’ve tried many times to figure out why some work (despite the same settings) while others don’t send. I also don’t understand why some subscribers receive Auto-responder messages while others don’t, despite being added to the same lists. The time since they registered doesn’t differ from the time those who receive these messages. The plugin requires a lot of patience from developers, not to mention non-technical users. This topic was modified 3 years, 5 months ago by Yui. This topic was modified 1 year, 4 months ago by Patryk. This topic was modified 8 months, 2 weeks ago by Patryk. This topic was modified 8 months, 2 weeks ago by Patryk.

   Read on wp.org ↗
5. ★★★★★ Musabah-hati

   5.2y ago

   the plugin works very well. Thank you

   Read on wp.org ↗
6. ★★★★★ Tobias

   6.4y ago

   Plugin works as intended. Great. This topic was modified 6 years, 3 months ago by Tobias.

   Read on wp.org ↗
7. ★★★★★ StevenW123

   8.6y ago

   Hi, Are you planning to update this, please? Tested up to: 4.8.4 Also, is this the same plugin that features on Codecanyon? If so, it’s a nice plugin! What limitations are there on this version, please? Thanks, Steve

   Read on wp.org ↗
8. ★★★★★ josemanuel8

   9.1y ago

   This is by far the most complete newsletter solution I came across. All built right into the WordPress dashboard without any subscriber limits for a one time fee. Love it!

   Read on wp.org ↗

Recent releases and news for this plugin

1. — Version 2.0.2 removed Freemius SDK 2.0.2
2. — Version 2.0.1 updated: readme 2.0.1
3. — Version 2.0.0 Completely rewritten from scratch For further details please visit the changelog on the Mailster Homepage 2.0.0

6 disclosed vulnerabilities on record for this plugin, 5 still affect the current version.

1. High · 7.2 Mailster - Email Newsletter Plugin for WordPress <= 4.1.17 - Authenticated (Editor+) Arbitrary File Upload ↗
   2026-07-22 CVE-2026-27064 Unrestricted Upload of File with Dangerous Type Affects <= 4.1.17 Patched in 4.1.18
2. Medium · 6.1 Mailster < 4.1.14 - Reflected Cross-Site Scripting ↗
   2025-10-27 CVE-2025-64203 Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') Affects < 4.1.14 Patched in 4.1.14
3. Medium · 6.1 Mailster <= 4.0.9 - Reflected Cross-Site Scripting ↗
   2024-06-28 CVE-2024-37433 Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') Affects <= 4.0.9 Patched in 4.0.10
4. Critical · 9.8 Mailster <= 4.0.6 - Unauthenticated Local File Inclusion ↗
   2024-04-15 CVE-2024-32523 Improper Control of Filename for Include/Require Statement in PHP Program ('PHP Remote File Inclusion') Affects <= 4.0.6 Patched in 4.0.7
5. Medium · 6.1 Mailster <= 1.0.3 - Reflected Cross-Site Scripting ↗
   2024-03-28 CVE-2024-30503 Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') Affects <= 1.0.3 Patched in 2.0.0
6. High · 7.2 Mailster <= 2.4.5.1 - Stored Cross-Site Scripting ↗
   2020-10-14 Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') Affects <= 2.4.5.1 Patched in 2.4.9

Automated install-time checks, tested on PHP 8.1.12 · WP 6.5.5

Translated into 1 language, 0 at 90% or more

Growth timeline

Install-tier crossings we have observed, and how long each tier took to outgrow

1. 2026-07-22 8K+ → 7K+ down after 95 days in tier
2. 2026-04-18 9K+ → 8K+ down after 2 days in tier
3. 2026-04-16 8K+ → 9K+ up after 1 days in tier
4. 2026-04-15 9K+ → 8K+ down after 97 days in tier
5. 2026-01-08 10K+ → 9K+ down after 846 days in tier
6. 2023-09-15 20K+ → 10K+ down

Competes with

The plugins that solve the same job, ranked by shared tags then reach, closest match first. The letter on the right is each plugin's health grade (A best, F worst).

• Formilla Edge Targeted Messaging Platform for Sales and Marketing 30+ installs · 4.1★ · 3 shared tags B
• FluentCRM – Email Newsletter, Automation, Email Marketing, Email Campaigns, Optins, Leads, and CRM Solution 80K+ installs · 4.7★ · 2 shared tags A
• Kit (formerly ConvertKit) – Email Newsletter, Email Marketing, Membership, Subscribers and Landing Pages 40K+ installs · 4.7★ · 2 shared tags A
• weMail – Email Marketing, Newsletters Builder & Email Automations for WooCommerce 10K+ installs · 4.0★ · 2 shared tags B
• MailUp for WordPress – Email and Newsletter Subscription Form 2K+ installs · 3.7★ · 2 shared tags B
• SendPress Newsletters 1K+ installs · 4.4★ · 2 shared tags B

Embed this report card

Drop a live Pulse card for Mailster WordPress Newsletter Plugin into a readme, a review or a deck. It updates itself.

Mailster WordPress Newsletter Plugin: 7K+ active installs, 3.5★ (8 reviews). Plugin Pulse (WP Mayor), as of 2026-08-25. https://plugins.wpmayor.com/plugin/mailster