The most trusted Email API at global scale. Send and optimize emails with the platform that delivers almost 40% of all B2B and B2C emails worldwide.
Email challenges holding your business back.
Deliverability crisis
Scaling limitations
Technical overhead
The unified email solution that delivers.
Enterprise-grade API
Developer-centric design
Future-proof infrastructure
Scale from 100 to billions with ease.
High-performance delivery
Auto-scaling technology
Maintain consistent performance whether sending hundreds or billions of messages. Our infrastructure scales automatically to meet demand without any configuration changes.
Adaptive delivery
Our algorithm adjusts email traffic in real-time based on receiving server responses.
Enterprise security
Quickly implement authentication and notifications with our security features.
Build faster with powerful tools.
Developer ecosystem
Expand your email capabilities
Powerful tools and infrastructure to optimize every aspect of your email program from sending to competitive intelligence.
Momentum MTA
Build email infrastructure that fits your needs. Customize and scale email sending with powerful MTA infrastructure tailored to your unique business requirements.
Competitive Tracker
Outperform competitors with market intelligence. Beat competition with intelligence from 250,000+ brands across 100+ industries to benchmark and optimize performance.
Inbox Tracker
Get more emails delivered to the inbox. Maximize inbox placement with real-time ISP monitoring, reputation insights, and automated deliverability optimization.
Power MTA
Take full control of your email delivery. Control your email infrastructure with on-premises server software designed for high-volume senders requiring complete ownership.
Optimize with data-driven insights.
Advanced analytics
Power critical communications across your business.
Use cases
Confirm orders instantly
Send order confirmations and updates guaranteed.
Welcome users seamlessly
Send critical alerts
Drive engagement
Deliver campaigns with optimized timing and placement.
Secure accounts instantly
Resolve issues fast
Respond to inquiries with messages that don't get lost.
Protect your data and your customers.
Compliance
Trusted by companies that demand results.
See how leading brands use Bird to power their email infrastructure.
Frequently asked questions
The Email API supports millions of emails per hour per account. Adaptive rate limiting automatically adjusts sending speed based on ISP throttling signals. Batch endpoints accept up to 1,000 recipients per request, and the API handles queuing and backpressure internally.
Yes. REST and SMTP are fully interchangeable — both support template rendering, open/click tracking, and delivery metadata. Use REST for maximum programmatic control or SMTP as a drop-in replacement for existing email infrastructure with zero code changes.
The deliverability engine manages IP warm-up schedules, monitors sender reputation across major ISPs, processes feedback loops automatically, and handles bounces and complaints. It adapts sending patterns in real time based on ISP signals to maintain 99.7% average inbox placement.
Yes. The sandbox environment processes email API calls identically to production — including template rendering and webhook delivery — but doesn't actually deliver messages. You can validate payloads, test templates, and verify webhook integration without sending real emails.
Bird's Email API follows standard REST conventions that map closely to SendGrid and Mailgun. Migration typically involves updating API keys, adjusting the send endpoint URL, and mapping field names. SMTP migration is even simpler — update your SMTP host, port, and credentials.