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OpenSend - Future Improvements & Deferred Features

This document tracks features, improvements, and ideas that are intentionally deferred from the initial MVP. These items are valuable but not essential for the first release.

Priority 1: Post-MVP (Next Release)

AI Content Policy Checker

Status: Queued for Phase 2 Description: Implement an AI-powered content policy checker that scans outgoing emails for:

  • Spam patterns and suspicious content
  • Phishing attempts or malicious URLs
  • Content that violates platform terms of service
  • Inappropriate or harmful material

Implementation Notes:

  • Use Claude Haiku for fast, cost-effective content analysis
  • Run asynchronously in the worker pipeline before SMTP send
  • Configurable strictness levels (strict/moderate/permissive)
  • Whitelist for trusted senders
  • Appeal/review queue for false positives
  • Log all blocked emails for audit purposes

API Design:

// Response when email blocked
{
  "id": "msg_abc123",
  "status": "blocked",
  "reason": {
    "code": "policy_violation",
    "category": "spam",
    "confidence": 0.94
  }
}

SMS Support (US/Canada)

Status: Queued for Phase 2 Description: Add POST /v1/sms/send endpoint with Telnyx carrier integration

Scope:

  • US and Canada phone numbers (E.164 format)
  • Standard SMS (160 chars) and concatenated messages
  • Delivery status webhooks
  • MCP tool: opensend_send_sms

Not in scope:

  • International SMS (complex carrier agreements)
  • WhatsApp or RCS
  • Inbound SMS / 2-way conversations

Batch Email Sending

Status: Queued for Phase 2 Description: Allow up to 100 emails per API request

API:

POST /v1/email/send/batch
{
  "messages": [
    {"to": "a@example.com", "subject": "Hi A", "body": "..."},
    {"to": "b@example.com", "subject": "Hi B", "body": "..."}
  ]
}

Priority 2: Production Readiness

IP Warmup Tooling

Description: Automated IP warmup scheduling for new dedicated IPs

  • Gradual volume increase over 4-6 weeks
  • Domain reputation monitoring
  • Automatic throttling on reputation dips

Deliverability Monitoring

Description: CLI-based dashboard for deliverability metrics

  • Bounce rates by domain
  • Spam complaint rates
  • Inbox placement estimates
  • Reputation scores from major providers

Railway/Fly.io One-Click Deploy

Description: Pre-configured deployment templates for hosted version

  • Railway template with PostgreSQL addon
  • Fly.io configuration with global edge
  • Environment variable setup wizards

Priority 3: Developer Experience

SDKs

Languages to support:

  • Python (pip install opensend)
  • Node.js (npm install @opensend/sdk)
  • Go (go get github.com/opensend/sdk-go)
  • Ruby (gem install opensend)

Email Templates (Basic)

Description: Simple Handlebars/Mustache templating

{
  "to": "{{email}}",
  "subject": "Welcome, {{name}}!",
  "template_id": "tmpl_welcome",
  "variables": {"name": "Alice", "email": "alice@example.com"}
}

Inbound Email Processing

Description: Receive emails at *.inbound.opensend.dev and forward to webhooks

  • Parse attachments
  • Extract plain text and HTML
  • Spam filtering
  • Custom routing rules

Priority 4: Enterprise Features

Single Sign-On (SSO)

Description: SAML/OIDC integration for enterprise customers

Audit Logging

Description: Complete audit trail of all API actions

  • Who accessed what data
  • Configuration changes
  • Immutable log storage
  • SIEM integration

Multi-Tenant Administration

Description: Organization-level management for agencies/resellers

  • Sub-accounts with usage limits
  • Billing aggregation
  • Usage reporting

Dedicated IP Management

Description: Self-service dedicated IP provisioning

  • IP allocation
  • Reputation monitoring
  • Automatic failover to shared pool

Priority 5: International Expansion

International SMS

Regions to consider:

  1. UK (after US/Canada)
  2. EU (GDPR complexity)
  3. Australia/NZ
  4. India (complex regulations)

Multi-Language Support

Description: API error messages and documentation in multiple languages

Regional Data Residency

Description: Deploy in EU, APAC regions for data sovereignty requirements

Ideas Backlog (Unvalidated)

These are ideas that need more research before committing:

  1. Email validation service - Check email deliverability before sending
  2. Sender reputation API - Let users check their domain reputation
  3. A/B subject line testing - Light analytics for testing subjects
  4. Calendar invite support - Native .ics attachment handling
  5. PGP encryption - End-to-end encrypted email option
  6. Scheduled sending - Send at a specific future time
  7. Email preview - Render email in major client simulators
  8. Unsubscribe link hosting - Managed unsubscribe pages
  9. BIMI support - Brand indicators for message identification
  10. ARC signing - Authenticated Received Chain for forwarding

Technical Debt to Address

Performance

  • Add Redis caching layer when needed
  • Implement connection pooling for high-volume scenarios
  • Add horizontal worker scaling

Observability

  • OpenTelemetry integration
  • Structured logging with correlation IDs
  • Metrics export (Prometheus format)
  • Distributed tracing

Security

  • Rate limiting per endpoint (not just per key)
  • IP allowlisting for API keys
  • Webhook signature verification improvements
  • Security audit by external firm

Testing

  • Load testing suite
  • Chaos engineering tests
  • End-to-end test automation

Contributing

Found something missing? Want to prioritize a feature?

  1. Open an issue with the feature-request label
  2. Describe the use case and expected behavior
  3. Vote on existing issues to help prioritize

The community's input helps shape what gets built next.

Last updated: 2026-01-28