Open-source alternative
for Postmark
Everything Postmark offers for transactional emails, plus marketing campaigns, workflow automation, and segmentation. One platform, no extra cost.
One Platform for All Your Emails
Transactional reliability meets marketing power
Transactional + Marketing
Reliable transactional emails plus marketing campaigns, workflows, and segmentation in one platform.
Transactional emails included Marketing campaigns included Workflow automation included
Transactional only
Excellent for transactional emails, but no marketing features. Need a second service for campaigns.
- Transactional emails only
- No marketing campaigns
- No workflow automation
Why Choose Plunk Over Postmark
Do more with one platform instead of two
Marketing Campaigns Included
Send newsletters, announcements, and promotional emails without needing a separate marketing platform. One platform, one bill.
Workflow Automation
Build automated email sequences with triggers, delays, and conditions. Onboard users, nurture leads, re-engage customers. All automated.
Dynamic Segmentation
Segment your audience based on behavior, properties, and engagement. Send targeted emails to the right people at the right time.
Open Source & Transparent
AGPL-3.0 licensed. Inspect the code, contribute features, understand exactly how it works. No proprietary black boxes.
Self-Hostable
Run on your infrastructure with Docker. Full data control, compliance-ready, cost-optimized. Postmark is cloud-only.
Pay-As-You-Go Pricing
Simple per-email pricing with all features included. No separate charges for transactional vs marketing emails. No tiers, no commitments.
Feature comparison
Stop juggling multiple tools. Get transactional reliability plus marketing power in one platform. Start free.