Mailster v4.1.21 WordPress Plugin
Mailster is a complete Email Marketing solution for WordPress in an easy to use plugin. It lets you create, send and track your Newsletter Campaigns while saving you hours of coding work. It has everything you need to grow, you don’t need to look for multiple plug-ins that’s not gonna work well together. Just list subscribers anywhere in your WP site or posts and It will show your signup forms and process the data immediately. The Mailster WordPress Plugin is the simplest, fastest and most powerful email marketing plugin for WordPress. It integrates with your website’s existing content to help grow your business and boost sales.
Core Features of Mailster WordPress Plugin
- Single or Double-Opt-in support
- WYSIWYG Editor with code view
- Unlimited Color Variations
- Optional Image embedding
- Track Opens, Clicks, Unsubscriptions and Bounces
- Track Countries and Cities
- Schedule your Campaigns
- Six types of auto responders
- Send your latest post to your subscribers
- Use dynamic and custom Tags (placeholders)
- Webversion for each Newsletter
- Embed Newsletter with Shortcodes
- Forward via Email
- Share with Social Media Services
- Unlimited Subscription Forms
- Automatic Inline Styles
- Background Image support
- Quick Preview
- Revisions support (native)
- Multi language ready
- SMTP support
- DomainKeys Identified Mail Support
- Import and Export for Subscribers
- Retina Ready
What’s New (Changelog) in Mailster v4.1.21
v4.1.21 (2026-10-19)
- fixed: retina loading spinner 404 when legacy form styles are printed inline
- fixed: All status filter count on subscribers screen showing 0
- fixed: tags with numeric names (e.g. "2026") can be created and assigned
- fixed: `mailster_list_removed` and `mailster_tag_removed` no longer run when the subscriber was not on that list or tag
- fixed: list-based unsubscribe still succeeds when the subscriber is not on every campaign list
- fixed: image placeholder endpoint no longer allows unbounded image sizes
- fixed: numeric custom date fields now keep date operators, formatted values, and export date formats
- improved: subscriber list tags and lists link to a filtered view of matching subscribers
- added: bulk actions to add or remove tags on the subscribers list
- changed: tag assign APIs treat integers as tag IDs and strings as tag names — custom code must cast IDs with `(int)` (numeric strings like `"42"` are names, not IDs)
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fixed: SQL error on form preview page
improved: loading time on subscribers overview