Mailster Integration

2 min readUpdated April 20, 2026

Mailster is a self-hosted email newsletter plugin for WordPress that handles list management, campaign creation, and email sending directly from your WordPress admin. Because Mailster runs directly on your WordPress site, WP Smart Consent integrates with it via Mailster’s native PHP API — no external API key or internet connection required.

What You’ll Need#

Mailster installed and active on the same WordPress site as WP Smart Consent. No API key or account setup is needed beyond that.

Setting It Up#

In the WP Smart Consent dashboard, go to Integrations and find the Mailster card. Enable it and save. WP Smart Consent will detect Mailster automatically and begin forwarding opted-in contacts as soon as the integration is active.

What Gets Sent#

When a visitor opts in, WP Smart Consent forwards their first name, last name, and email address to Mailster via mailster('subscribers')->add(). The contact is added to your Mailster subscribers list immediately. If the contact already exists, their record is updated rather than duplicated.

List Assignment#

By default, contacts are added to your default Mailster list. If you need to assign subscribers to a specific list, this can be controlled programmatically using the wpsc_mailster_list_id filter.

Works Alongside Other Integrations#

Enabling the Mailster integration doesn’t affect any of your other active integrations. Each destination is independent — a single opt-in event will be forwarded to Mailster and every other enabled destination simultaneously, and logged with the source integration that captured it.