Active installations10Adoption metric — not a quality score
WordPress.org ratingNo WordPress.org ratings yet
Official packageDirect from WordPress.org
Repository metrics are context, not quality scores. Active installations measure adoption and can strongly reflect a plugin’s age and historical popularity. Ratings, recent updates and “Tested up to” metadata also do not guarantee modern code, error-free operation, security, feature completeness or suitability for a particular site. Why active installs don’t tell the whole story →
WP PlugIndex currently records Mailster Dummy Mailer version 1.3.0 as active, updated 19d ago and tested up to WordPress 7.1.
Overview
About this plugin
Mailster Dummy Mailer is a Mailster delivery method for WordPress newsletter development and testing. It registers as DummyMailer under Mailster’s delivery settings so you can run campaigns, workflows, and send tests without delivering real email to inboxes.
Use it when you need to exercise Mailster on staging or locally: practice campaign flows, tune how statistics look, and avoid accidental sends to live subscribers.
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0 or newer. It does not send mail through SMTP or a third-party ESP—sending and engagement are simulated on your site.
What you can simulate
Delivery without inbox delivery — Outgoing Mailster sends are marked successful or failed based on your configured rates; no real messages leave the server.
Open, click, unsubscribe, and bounce rates — Set target percentages so cron-driven simulation can produce campaign statistics that match your test scenario.
Success and campaign error rates — Control how often a simulated send succeeds versus failing with a campaign-level or subscriber-level error.
Optional admin notice — Show a clear warning on Mailster newsletter screens so you know Dummy Mailer is active.
Simulated client and IP data — During simulation, random client profiles and IPs can be used for engagement events.
Workflows — Compatible with Mailster 4.0+ campaign workflows (alongside finished, active, and paused campaigns).
Who it is for
Developers building or customizing Mailster sites
Agencies staging newsletters before go-live
Anyone who needs newsletter testing without a live ESP or real recipients
Important notes
Dummy Mailer is for development and testing, not production sending.
Simulation can use significant memory; 256MB of PHP memory (or more) is recommended.
Switch back to Simple, SMTP, or another Mailster delivery method before real campaigns. Deactivating this plugin resets the delivery method to Simple if DummyMailer was selected.
Learn more about Mailster delivery methods in the Mailster knowledge base.
Additional Info
0 or newer. It does not use a third-party email API; all simulation runs on your WordPress site.
WordPress.org metadata
Plugin tags
Topics listed for this plugin in the WordPress.org directory.
delivery
email
mailster
newsletter
testing
Compatibility & maintenance
Compatibility & maintenance
Tested with WP 7.1
Marked as tested with the current WordPress 7.1 release.
Current WordPress releaseWordPress 7.1
WordPress.org Tested up to7.1
Minimum requirementsWordPress 6.0 · PHP not listed
Update activity13 Oct 202619d ago
“Tested up to” is directory metadata supplied by the plugin author. WP PlugIndex does not turn an older declaration into a claim that the plugin is incompatible.
Changes recorded by WP PlugIndex
Recent tracked changes
Version1.2.3→1.3.0
Version1.2.2→1.2.3
WordPress compatibility6.5.10→7.1.3
Tracking & source
WP PlugIndex tracks public WordPress.org directory metadata and records selected version, compatibility and availability changes as they are detected.
