Engineered for zero message loss under catastrophic conditions
When password resets, OTP codes, and payment receipts fail, your business halts. Mailofly's multi-region architecture guarantees that every accepted message reaches its recipient.
Uptime SLA guarantee
Cross-region queue replication
Single points of failure
Engineered for developer velocity
Replicated message queues
Every incoming API request is immediately committed to persistent storage across multiple availability zones.
Smart exponential retry logic
Temporary downstream ISP errors trigger automatic retries with intelligent jitter to prevent thunderous herds.
Enterprise disaster recovery
Independent data center failover ensures full operational continuity even during regional cloud outages.
How it works
API submission
Your server dispatches a transactional request and receives a fast 200 OK message ID.
Replicated persistence
The payload is safely written across multiple distinct availability zones.
Guaranteed delivery
Messages are retried until successfully accepted by the recipient's mail exchanger.
Explore related features
Global edge network
Distributed dispatch clusters across North America, Europe, and Asia-Pacific ensure lightning-fast API response times for global users.
Smart dynamic routing
Intelligently routes traffic to the fastest regional servers and fallback SMTP providers based on ISP latency and deliverability health.
Automatic IP warmups
Intelligent hourly and daily rate governors gradually build domain and dedicated IP reputation automatically so you never trigger spam velocity blocks.
Ready to build with Built-in redundancy?
Join thousands of engineering teams delivering transactional and lifecycle email with blazing speed and zero downtime.