DoubleZero vs Postmark: Features, Pricing and User Reviews 2026
Compare features, pricing, reviews, and more to make an informed decision
DoubleZero
DoubleZero is a free, open-source email service you can host yourself using AWS SES for sending and monitoring emails.
Postmark
Postmark is a fast and reliable email delivery service that helps businesses send transactional emails through SMTP and API integration.
DoubleZero
DoubleZero is a free, open-source email service you can host yourself using AWS SES for sending and monitoring emails.
Postmark
Postmark is a fast and reliable email delivery service that helps businesses send transactional emails through SMTP and API integration.
DoubleZero
Self-hosted email service with AWS SES integration
Email monitoring dashboard with delivery tracking
Multi-recipient tracking and analytics
REST API and JavaScript client library
Open source and fully customizable
Docker container deployment
SST automated AWS configuration
Pro version with WYSIWYG editor and automation
Contact and list management capabilities
Team collaboration features
Postmark
Fast email delivery to inbox in seconds
API and SMTP integration options
Pre-built responsive email templates
Detailed tracking and analytics
Message streams for email separation
Bounce and spam monitoring
Expert customer support team
DMARC security tools included
Webhook notifications for events
Multiple programming language libraries
Domain authentication assistance
Real-time delivery statistics
DoubleZero
DoubleZero offers two pricing options that stand out from typical subscription services.
The Free Version is completely open source and available at no cost. You can download the code, host it yourself, and use all core features including transactional emails, monitoring dashboard, multi-recipient tracking, SMTP endpoint, and REST API access. Your only costs are AWS SES fees, which are extremely low at around $0.10 per thousand emails.
The Pro Version costs $175 as a one-time purchase. This is not a monthly subscription. You buy it once and own it forever. Pro adds powerful features including a WYSIWYG email editor, contact management system, email lists, broadcast campaigns, team collaboration tools, activity feed, and automation workflows.
Both versions require you to provide your own AWS account and hosting, giving you complete control and keeping ongoing costs minimal.
Postmark
Postmark offers clear pricing plans to fit different needs. Every account starts with a Free Developer Plan that includes 100 emails every month and never expires - perfect for testing or small projects.
The Basic Plan costs $15 per month and includes 10,000 emails. You can add more at $1.80 per 1,000 extra emails. This plan supports up to 4 users and 5 servers.
The Pro Plan at $16.50 monthly includes 10,000 emails with additional emails at $1.30 per 1,000. It offers up to 6 users, 10 servers, and includes inbound email features.
The Platform Plan costs $18 monthly for 10,000 emails, with extras at $1.20 per 1,000. It includes unlimited users, servers, and all advanced features.
High-volume senders can contact their team for custom pricing with dedicated IP addresses and priority support.