What it does
Mailster runs newsletter editing, subscriber management, reporting and automation inside WordPress. Workflows can start from list joins, field changes, page visits, tags or custom hooks, with SMTP and email-provider connections for sending. A purchased site license permits continued use; updates and personal support require renewal.
Mailster can use activity on the WordPress site to start a newsletter workflow. A subscriber joining a list, visiting a page or receiving a tag can begin a sequence; a custom PHP hook gives a developer another entry route. For a resource library, a tag for the requested subject can start the relevant introduction rather than sending the same follow-up to every visitor.
Delays and conditional paths shape the sequence after entry. Date triggers also support anniversaries or a particular scheduled date. Campaign reports and subscriber activity remain in the WordPress workspace, while an SMTP connection or supported provider sends the mail. The delivery capacity depends on that infrastructure.
The pricing distinction is continued use versus maintenance. Mailster says the purchased features remain usable after license expiry, but an active renewed license is needed for updates and personal support. Packages also have different active automation and precheck allowances. Each listed license covers one site or domain.
| Plan | Active automations | Campaign prechecks per month |
|---|---|---|
| Starter | 3 | 10 |
| Professional | 10 | 100 |
| Agency | Unlimited | 1,000 |
Strengths
- Site activity, subscriber tags and custom hooks provide specific workflow triggers
- Newsletter work stays close to the WordPress content it supports
Watch out for
- Updates and personal support require an active renewed license
- Automation and campaign-precheck allowances vary by package
- Sending capacity depends on the connected delivery infrastructure
Best for
- WordPress publishers connecting site activity to subscriber follow-ups
Sources
- Send Beautiful Email Newsletters in WordPress. (Oct 25, 2026)
- Email Marketing Automation • Mailster (Oct 25, 2026)
- Mailster pricing and license terms (Oct 27, 2026)