Zero-downtime routing across multiple upstream providers
Eliminate single points of failure. If an upstream provider or cloud region experiences an outage, Mailofly automatically reroutes traffic without losing a single email.
Dropped emails during outages
Automatic failover detection
Upstream provider support
Engineered for developer velocity
Active health probes
Continuous health probes monitor upstream SMTP connection latency and rejection error codes.
Seamless fallback execution
Automatically reroutes messages through backup dedicated IPs or secondary providers within seconds.
Weight-based distribution
Split volume across multiple identities or providers according to custom percentage quotas.
How it works
Configure providers
Connect your primary and fallback sending identities (Gmail, Yahoo, custom SMTP).
Set routing policy
Choose fastest-latency, round-robin, or active-passive failover strategies.
Enjoy uninterrupted sending
Mailofly monitors connection health and reroutes traffic automatically if an ISP stalls.
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.
Automatic IP warmups
Intelligent hourly and daily rate governors gradually build domain and dedicated IP reputation automatically so you never trigger spam velocity blocks.
Built-in redundancy
Redundant storage queues, automated exponential retries, and cross-region replication guarantee 99.99% availability for mission-critical notifications.
Ready to build with Smart dynamic routing?
Join thousands of engineering teams delivering transactional and lifecycle email with blazing speed and zero downtime.