How to Build Your Own Postmark
Replace Postmark with a custom build. The email delivery service that people actually like
Build Difficulty: 5/5
Build a working replacement in a weekend with AI tools
Estimated Timeline
Based on 37 features at Weekend Project difficulty, expect about One weekend with AI-assisted development.
Recommended Tech Stack
Full-stack React framework with API routes and server components
PostgreSQL database, auth, and real-time subscriptions
Utility-first styling for rapid UI development
Transactional and marketing email delivery
Key Features to Replicate
Top features across 8 categories. See all 37 features
Security(8 features)
Granular controls for API token permissions
Protection against DDoS attacks
Email authentication standards to improve deliverability
Monitor DMARC authentication issues and identify unauthorized senders
Regular penetration testing for security
+3 more in this category
Email Management(5 features)
Automatically suppress bounced and complained emails
Tag emails for better organization and filtering
Convert inbound emails into JSON objects and post to webhooks
Separate sending infrastructure for transactional and promotional emails to protect deliverability
Manage email suppression lists
Analytics(4 features)
Comprehensive email analytics including delivery, bounce, spam, and open rates
Track when recipients open emails
Detailed bounce data to identify and troubleshoot delivery issues
Monitor and track email links to improve engagement
Infrastructure(4 features)
Fully managed dedicated IPs for high-volume senders
Shared IPs that are carefully vetted and maintained for high deliverability
SMTP routing across multiple regions for optimal delivery
Support for multiple sending servers
Developer Tools(3 features)
Interactive API documentation
Guides for migrating from SendGrid, Mailgun, Amazon SES, SparkPost, Mailchimp, and other providers
Official libraries for Rails, Ruby, .NET, PHP, Node.js and other languages
Email Sending(3 features)
Send emails in batches
Send bulk promotional and broadcast emails
Send emails using SMTP protocol
API(2 features)
Send emails via REST API with support for multiple programming languages
API access to delivery statistics
Integration(2 features)
Receive webhooks for email delivery events
New Model Context Protocol (MCP) server for integration with AI tools
Cost Calculator
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Build It Yourself
Total Cost Comparison
DIY hosting estimate based on Vercel + Supabase free/pro tiers (~$20/mo). Build time estimated from 37 features at very easy complexity.