Useplunk

An open-source email platform that combines transactional emails, marketing campaigns, and workflow automation into a single tool, solving the problem of managing multiple email services. It targets developers, marketers, and operations teams at startups to mid-market companies. It is positioned as a self-hostable, open-source alternative with flat pricing of $0.001 per email, no contact limits, and GDPR compliance.

Key features

• Workflow automation with visual builder
• Real-time audience segmentation
• Campaign broadcast with scheduling
• Detailed analytics on opens and clicks
• Inbound email processing with webhooks
• Custom sending domains with DKIM
• Zero-configuration setup under 5 minutes
• Unlimited contacts at no cost