WP Mailster allows your users to be part of a group and communicate by email without having to log into a website.
As of April 2026, WP Mailster is a WordPress mailman plugin with 400 active installations and a 4.9/5 rating from 32 reviews. It has been downloaded 31K+ times in total. Requires WordPress 5.3+ and PHP 5.6+. Available on WordPress.org since 2017. Actively maintained — updated within the last month. Support resolution rate: 100%. Top alternative: Contact Form with Mailman.
True two-way group communication over email
WP Mailster allows your users to be part of a group and communicate by email without having to log into a website.
Similar to programs like Mailman or Listserv this plugin allows you to run a discussion mailing list.
That means that every email sent to a central email address is forwarded to the rest of the members of the list.
When members reply to such list emails WP Mailster again forwards them to the other list recipients.
Unlike newsletter plugins this allows true two-way communication via email.
| WordPress | 5.3+ requiredTested up to 6.9.4 |
| PHP | 5.6+ required |
Release Date – March 20th, 2026
* [Bug Fix] Avoid PHP 8.3 warnings Deprecated: Creation of dynamic property
* [Bug Fix] Fix: avoid “array_merge(): Argument #2 must be of type array, null given”
* [Bug Fix] Fix deprecation warnings about utf8_encode and utf8_decode
Plugin data sourced from WordPress.org. Analysis and metrics by PluginSift.