Plunk is an SMTP email marketing platform and contact relationship manager used for sending bulk broadcasts and transactional emails. It provides a transactional email API for delivering personalized messages using templates and variable substitution, supported by built-in analytics and custom domain authentication.
The platform features an email automation workflow engine with a visual builder for creating multi-step sequences triggered by user events and conditional logic. It includes a dynamic audience segmentation tool that groups contacts based on real-time data attributes and behavioral patterns.
The system manages contact databases through a relational data store that tracks full user activity history and unifies interactions from campaigns and workflows. It covers a broad range of delivery and monitoring capabilities, including SMTP relay services, inbound email processing via webhooks, and delivery analytics for tracking open and click-through rates.
Security is handled through custom domain authentication, enabling the management of DKIM and SPF records to verify sender identity.
