Mailster Block Forms


Create newsletter signup forms for Mailster with the block editor.

Read the documentation

This is a BETA feature and requires a dedicate plugin. Some features are subject to change before the stable release. Please submit your feedback on Github


  • updated blocks to API version 3
  • better caching for frontend queries
  • added new form pattern


  • RC 2!
  • fixed: editor problems on WordPress 6.3 with iframed editor
  • improved: inline style mechanism
  • improved: honey pot mechanism


  • fixed: form submission works again by using return key
  • fixed: error when localStorage is not avialable
  • improved: inline style mechanism


  • RC 1: We’ll soon merge this into the core plugin!
  • change: changed the post type from newsletter_form to mailster-form
  • improved: performance in the editor by preventing unnecessary re-renders
  • new: 2 patterns added
  • improved: updated existing patterns
  • added: support for textareas from custom fields
  • change: move styling options to styling section in the inspector if feasible
  • improved: inline styles are now also updated if form is used on other pages
  • improved: forms can now get submitted if no submit button is present
  • improved: removed some CSS effects for accessibility


  • fixed: invalid method in shortcode callback


  • new: 6 new form patterns
  • new: option for fullscreen background image
  • new: support for Elementor with a dedicate widget
  • fixed: user choice of lists were disabled if switching from code view back to editor view
  • improved storing of block attributes


  • new: newsletter homepage block (
  • fixed: proper removing of GDPR block
  • change: endpoint for form submission
  • improved: renamed internal methods
  • reverted: form name is now back in the options panel
  • preparations for Mailster 4.0


  • improved: rendering of compontents
  • improved: css for latest WordPress version
  • improved: frontend script to make it more relyable
  • improved: frontend storage selector now working if localStorage is not available
  • improved: Form and Input styles panel is now collapsable again
  • improved: auto block recovery now works with nested blocks
  • fixed: CSS and Events code editor now working correctly
  • change: Form name is now a dedicate section and not collapsable
  • update: display Mailster admin header with Mailster 3.3.3


  • new filter mailster_block_form_field_errors for third parties
  • new mailster_block_form filter containing form html
  • new ‘load’ trigger on forms
  • fixed: check referrer to prevent errors if it’s not defined


  • fixed: display issue of cover block in forms with WP 6.1 and Gutenberg 14.2+
  • fixed: message block are not added correctly with WP 6.1 and Gutenberg 14.2+


  • new: define custom JavaScript code to get triggered on certain form events.
  • fixed: unable to change the value of the scroll trigger threshold.
  • fixed: don’t scroll to bottom of page in preview pane if form has not been saved for the first time.
  • fixed: excerpt was empty on archive page if form was used in content.
  • improved: accessibility on form submission messages (may require form updates).
  • improved: close button accessibility.
  • redirection after form submission now delayed for 150ms to complete all remote events.
  • updated: referrer is now the current page if no the referrer is from the same origin.
  • padding for popups in preview panel is not unset by default.


  • updated cool down method (Please update this settings in the Appearance menu)
  • using fieldsets for accessibility
  • use preventDefault on button click to prevent default behavior
  • preview improvements


  • tab now iterates through elements for accessibility.
  • fixed: close button wasn’t visible on some mobile devices


  • new block with a close link to close the popup
  • improved accessibility on close buttons
  • re-enabled kses filter on HTML output


  • fixed: classic editor is shown if classic editor plugin is enabled
  • improved: validation of post message in preview modal
  • fixed: always load form data even on preview screen


  • added option to change to alignment of form fields


  • initial release

Additional Info

This Plugin requires Mailster Newsletter Plugin for WordPress



This plugin provides 8 blocks.

  • Mailster Form Use a Mailster Block Form on your page
  • Mailster Homepage
  • Lists Field Adds a List block to your Mailster Block Form
  • Mailster Form Define the look of your form here.
  • Message Field Adds a Message field to your Mailster Block Form
  • Close Link A simple link to close the popup
  • GDPR Field Adds a Checkbox to your Mailster Block form for GDPR compliance
  • Mailster Homepage Section Use this block to add content to certain sections only.


  1. Upload the entire mailster-block-forms folder to the /wp-content/plugins/ directory
  2. Activate the plugin through the ‘Plugins’ menu in WordPress
  3. Go to Newsletter => Block Forms
  4. Click on “add New” to create a new form.


Can I use this as a stand alone plugin?

No, Mailster 3.2.0 or above is required to use this plugin. Get it here.


February 24, 2023
The plug-in add-on is not working properly. Support has been looking for solutions around for a week, instead of fixing the problem on plugin. I can't add a fev products. Styled forms not working, you must add css code on template. This is joke, not stabily plugin.
Read all 1 review

Contributors & Developers

“Mailster Block Forms” is open source software. The following people have contributed to this plugin.


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Interested in development?

Browse the code, check out the SVN repository, or subscribe to the development log by RSS.