99.99% Server Availability

Worldwide cloud clusters in geographically dispersed data centers that are truly distributed, real-time swappable and load balanced without compromising low latency.

Fault Tolerance

When a server in the CritSend's Deliverability Engine Cluster sends a message, it is replicated on several other machines

Scalability

Our servers are equipped to handle explosive and sudden bursts in sends for your launch, growth, or large company

Continuous Testing

Each server tests itself regularly for deliverability using technologies such as real-time blacklist detection, log analysis among others.

No disruption in mail streams

If a server encounters an issue with a specific ISP or blacklist, it automatically rebalances its affected load to other servers and alerts are sent to CritSend HQ for immediate investigation. This ensures that there is no disruption in customer mail streams