130+ features built for email delivery
From transactional API to marketing automation and AI-powered optimization. Every feature you need to send, track, and improve email at scale.
Email Delivery
High-performance email infrastructure built on KumoMTA with intelligent routing and real-time monitoring.
REST API & SMTP Relay
Send emails via RESTful API or standard SMTP. Sub-12ms API latency with automatic failover. Batch sending supports up to 10,000 recipients per request.
Open & Click Tracking
Pixel-based open tracking and link-level click tracking. Custom tracking domains for brand consistency. Real-time event webhooks.
Bounce Processing
Automatic bounce classification with 50+ bounce codes. Hard bounces auto-suppressed, soft bounces retried with exponential backoff. FBL processing built in.
DKIM, SPF & DMARC
Auto-generated DKIM keys with 3-layer defense (memory, filesystem, HTTP fallback). SPF and DMARC record generation. No unsigned email ever leaves the system.
Marketing Automation
Visual workflow builder for drip campaigns, triggers, and multi-step automations.
Visual Campaign Builder
Drag-and-drop workflow designer with branching logic, time delays, and conditional splits. Preview the entire journey before launching.
Drip Campaigns
Timed email sequences with dynamic content. Trigger campaigns based on user actions, properties, or external events via API.
A/B Testing
Test subject lines, content, send times, and sender names. Automatic winner selection based on open rate, click rate, or conversion.
Smart Scheduling
AI-powered send-time optimization per recipient. Timezone-aware delivery windows. Throttling to protect sender reputation during warmup.
Contact Management
Unified contact profiles with segments, tags, and custom fields for precise targeting.
Dynamic Segments
Build segments with AND/OR conditions on any contact property, behavior, or event. Segments update in real-time as contacts change.
Lists & Tags
Organize contacts into lists and apply unlimited tags. Bulk operations with CSV import supporting 500K+ contacts per upload.
Custom Fields
Add unlimited custom fields with types: text, number, date, boolean, dropdown, and JSON. Use custom fields in templates and segments.
Contact Import & Export
CSV and JSON import with field mapping and deduplication. Background processing for large files. Export any segment to CSV.
Multi-Channel Messaging
Reach customers on their preferred channel: email, SMS, WhatsApp, or web push.
SMS Messaging
Twilio-powered SMS with A2P 10DLC registration support. Two-way messaging, keyword triggers, and delivery receipts. Global coverage.
WhatsApp Business
Meta Cloud API integration with template message management. Rich media support, interactive buttons, and conversation tracking.
Web Push Notifications
VAPID-based web push with subscription management. Segmented push campaigns with rich content, images, and action buttons.
Cross-Channel Orchestration
Build automations that span multiple channels. Fallback logic: if email not opened, send SMS. Unified analytics across all channels.
AI Features
Self-hosted AI models for content generation, optimization, and insights -- no data leaves your infrastructure.
Subject Line Generator
AI generates high-performing subject lines based on your audience and content. A/B test AI suggestions against your own to continuously improve.
Content Writer
Generate email body copy from prompts or outlines. Maintains your brand voice with custom style training. Supports multiple languages.
Send-Time Optimizer
Machine learning model predicts optimal send time per recipient based on historical engagement patterns. Improves open rates by up to 23%.
Spam Score Predictor
Pre-send spam analysis using Rspamd and SpamAssassin engines. Get actionable recommendations to improve inbox placement before you hit send.
Analytics & Reporting
ClickHouse-powered real-time analytics with custom dashboards, KPI tracking, and export.
Real-Time Dashboards
Monitor delivery, bounces, opens, clicks, and unsubscribes in real-time. Domain-level, campaign-level, and contact-level drill-down.
Custom Reports
Build custom reports with any combination of metrics and dimensions. Schedule automated report delivery to stakeholders.
Geographic Analytics
See where your emails are opened on an interactive map. Track engagement by country, region, and city for localized campaigns.
Deliverability Monitoring
Track inbox placement across major ISPs. Domain reputation scoring, blacklist monitoring, and automated recovery workflows.
Security & Compliance
Enterprise-grade security with encryption, RBAC, audit logging, and compliance features.
Encryption & DKIM
TLS 1.3 for all connections. DKIM signing on every outbound email with automatic key rotation. S/MIME certificate support.
Role-Based Access Control
Fine-grained permissions with custom roles. Separate admin, sender, analyst, and viewer roles. Multi-factor authentication required.
Audit Logging
Every action logged with user, timestamp, and IP address. Immutable audit trail for compliance. Export to SIEM systems.
GDPR & CAN-SPAM
Built-in consent management, unsubscribe handling, and data retention policies. One-click contact data export and deletion.
Developer Tools
SDKs, CLI, webhooks, and comprehensive API documentation for seamless integration.
SDKs & Libraries
Official SDKs for Go, Node.js, Python, PHP, Ruby, and Java. Type-safe with full IDE autocomplete. Available on npm, PyPI, and pkg.go.dev.
CLI Tool
Command-line interface for managing domains, sending test emails, viewing logs, and deploying templates. Scriptable for CI/CD pipelines.
Webhooks
Real-time event webhooks for delivery, bounce, open, click, and unsubscribe events. HMAC-signed payloads with dead-letter queue and retry.
API Documentation
Interactive API reference with code examples in 6 languages. Postman collection and OpenAPI 3.1 specification included.
Start building with Flowvaro today
1,000 free emails per month. Full API access. No credit card required.