Mailster review
A self-hosted WordPress email tool with automation, segmentation, and provider integrations.
Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026
Mailster is an open-source, self-hosted WordPress plugin for creating and sending newsletters and automated email campaigns. It suits WordPress site owners who want subscriber data stored in their own site database, with control over forms, lists, templates, delivery, and campaign reporting. Its feature set covers a drag-and-drop editor, merge tags, custom templates, rule-based segmentation, signup forms and popups, RSS-to-email campaigns, time-zone-based sending, and analytics for campaigns and subscribers.
Mailster is sold through paid licenses rather than a free plan. The published plans are Starter, Professional, and Agency. Each plan lists one site/domain, one year of support, one year of updates, unlimited subscribers, unlimited lists, and unlimited forms. The shared highlights make the plan names less informative for buyers comparing core functionality. Delivery costs and sending capacity also depend on the server infrastructure and the selected SMTP or external email provider, so the license is only one part of the operating setup.
Its strongest ecosystem fit is WordPress: integrations and add-ons connect Mailster with tools including Gravity Forms, Contact Form 7, MemberPress, Easy Digital Downloads, WS Form, and Super Forms. Delivery options include Mailjet, Mailgun, Gmail, MailerSend, SparkPost, and SendGrid, while Mailchimp Importer supports migration of subscriber data. Choose Mailster if WordPress ownership, self-hosting, and flexible automation matter more than a hosted email service. Consider another product if verified A/B testing, landing-page creation, or a more clearly differentiated tier structure is central to your buying decision.
Mailster pros and cons
- Where it wins
- Automates welcome, birthday, drip, follow-up, and autoresponder campaigns
- Supports rule-based segmentation, forms, popups, and RSS-to-email
- Connects with SMTP, external providers, and WordPress plugins
- Where it doesn't
- Requires self-hosted WordPress and server infrastructure for sending
- Plan pages list the same core highlights across Starter, Professional, and Agency
- No verified A/B testing or landing-page builder capability
Mailster fact sheet, pricing and score →
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