Email Infrastructure Platform

Part of the worlds-biggest-software-project initiative.

An open, AI-native transactional email platform with templates, analytics, and deliverability tooling built in.

Transactional email — password resets, order confirmations, billing receipts, security alerts — is mission-critical but notoriously hard to deliver reliably. This project provides a managed sending platform accessible via API, SMTP relay, and SDKs, handling IP reputation, authentication, bounce processing, and deliverability monitoring so application teams do not need deep email-protocol expertise.

Why Email Infrastructure Platform?

Building in-house email delivery requires managing SMTP servers, IP warm-up, SPF/DKIM/DMARC alignment, bounce and complaint handling, and ISP feedback loops — specialist work most product teams lack.
Mixing transactional and marketing email on shared infrastructure (a common pitfall on platforms like SendGrid) lets a single complaint spike from a promotional campaign delay critical user emails.
Incumbents are split: Postmark is transactional-only but has no marketing path; Amazon SES is cheapest at scale but requires significant configuration and lacks a polished developer dashboard; SendGrid suffers feature sprawl.
Email authentication standards (SPF, DKIM, DMARC) are open RFCs with no patent encumbrances, but the entire category is currently proprietary SaaS — there is no credible open-source managed sending platform.
AI-drafted transactional content (dynamic product recommendations in order emails, personalised copy) is a 2026 trend that current template engines handle poorly.

Key Features

Sending and Integration

REST API and SMTP relay for flexible integration from any language or platform
Idempotency-key support to prevent duplicate sends on retry
Inbound email parsing with structured webhook payloads for reply tracking and support inbox use cases
Client SDKs across major languages

Deliverability and Reputation

SPF, DKIM, and DMARC DNS configuration assistant for custom sending domains
Shared and dedicated IP pools with automatic warm-up scheduling for new dedicated IPs
Bounce and complaint webhook processing with automatic suppression list enforcement
Message Streams: independent sending infrastructure, suppression lists, and analytics per email category (password reset, order confirmation, notifications)
Reputation monitoring and blocklist alerting

Templates and Content

Stored templates with variable substitution, versioning, and dashboard preview
React-component-based template development workflow (in line with the React Email approach popularised by Resend)
Email preview before send
A/B testing for transactional subject lines and content variants

Analytics and Observability

Delivery event log searchable by recipient, subject, or message ID
Real-time webhooks for delivered, opened, bounced, clicked, and complained events
Per-message delivery timeline with timestamps for each processing stage
Deliverability dashboard tracking delivery rate, bounce rate, and complaint rate
DMARC monitoring and reporting

AI-Native Advantage

The platform integrates AI where it materially improves deliverability and developer experience: a pre-send deliverability assistant that flags spam-trigger words, authentication gaps, and image-to-text ratio issues; AI-generated personalised transactional copy that template engines handle gracefully (variable-length LLM output); subject and preheader suggestions; and anomaly detection on bounce and complaint trends to catch reputation problems before ISPs do.

Tech Stack & Deployment

The platform is intended to be offered as a managed service, with a self-hostable core for teams that need to operate their own sending infrastructure. Integration is via REST API and SMTP relay, with SDKs for major languages and webhook event streaming. Authentication is built on the open SPF, DKIM, and DMARC RFCs. A React Email-style component library (MIT-licensed in the Resend ecosystem) is the reference template-development workflow.

Market Context

The transactional email market is well-established and competitive. Pricing benchmarks: Amazon SES is the cost leader at roughly USD 0.10 per 1,000 messages, with developer-oriented platforms (Resend, Postmark, SendGrid, Mailgun, Brevo) priced significantly higher in exchange for tooling and managed deliverability. Buyers are primarily application engineering teams and platform engineering teams responsible for user-facing communications; secondary buyers are operations and compliance teams concerned with deliverability and regulatory adherence (CAN-SPAM, GDPR). All current incumbents in this category are proprietary SaaS.

Project Status

This project is in the research and specification phase.
Contributions, feedback, and domain expertise are welcome.

Contributing

We welcome contributions from developers, domain experts, and potential users. See CONTRIBUTING.md for guidelines.

Important: All contributions must be your own original work or clearly attributed open-source material with a compatible licence. Copyright infringement and licence violations will not be tolerated and will result in immediate removal of the offending contribution. If you are unsure whether a piece of code, text, or other material is safe to contribute, open an issue and ask before submitting.

Licence

Licence to be determined. See discussion for context.