Facing the scenario of millions of enterprise users and billions of daily email interactions, Alibaba Enterprise Email can achieve stable operation and fast transmission 24/7, thanks to its cloud native distributed architecture built on the Alibaba Cloud Feitian Cloud platform. As a cloud native distributed email system independently developed by Alibaba Cloud, this architecture supports two output modes: public cloud and private cloud, integrating core technologies such as containerized deployment, elastic scaling, intelligent routing, and tiered storage. It has the characteristics of massive throughput, load balancing, and distributed high availability. Relying on Alibaba's self built global data center, it achieves a "no lag, no loss, no delay" email service experience. After 20 years of operation and maintenance experience, it can support large-scale user loads.

The core support of distributed high availability architecture is the containerized deployment and multi node redundancy technology of Feitian Cloud platform. Alibaba Enterprise Email adopts a containerized deployment mode, which enables flexible resource scheduling and supports horizontal and vertical hot expansion of computing resources. Multiple nodes are not divided into roles, and service level redundancy can achieve email services drifting across different nodes at the minute level. When a node fails, the backup node can quickly take over the business, achieving "single point of failure does not affect the global". The service availability is as high as 99.99%, ensuring that enterprise email services are available 24/7. The server clusters are distributed in multiple regions including North China, East China, South China, and overseas, covering the networks of mainstream telecom operators such as China Telecom, China Unicom, and China Mobile. At the same time, Alibaba has built its own global data center, providing dedicated channels for domestic and international email communication, effectively bypassing domestic and international network bottlenecks, and improving cross regional email transmission efficiency.

Intelligent routing and transmission optimization technology to achieve global email speed and efficient transmission. In response to the network differences among different domestic operators and the complexity of international network links, Alibaba Enterprise Mail has built a transmission system that combines intelligent DNS scheduling with overseas dedicated lines. It can automatically select the optimal transmission path based on the network environment and link quality of the sender and receiver, avoiding network congestion. In a common 10M bandwidth environment, the transmission time of 50MB attachments does not exceed 8 seconds, and the transmission efficiency is improved by more than 30% compared to similar products; For international email transmission, relying on overseas exclusive channels and intelligent routing technology, significantly reducing returns and delays. At the same time, through Alibaba's global reputation guarantee mechanism, it can quickly handle the situation where the server is blacklisted by international anti spam organizations, ensuring smooth international email sending and meeting the cross regional communication needs of foreign trade enterprises and multinational companies.

Optimizing storage architecture achieves a perfect balance between "unlimited capacity" and efficient access, completely solving the problem of enterprise email storage. Alibaba Enterprise Email breaks through the limitations of traditional email technology and truly achieves unlimited storage capacity for single account emails, eliminating the need for employees to manually archive and free up space, greatly reducing the operational burden on administrators and employees. The system adopts a hierarchical storage architecture, which classifies and stores commonly used emails, historical emails, and attachment data. Commonly used emails are stored on high-performance SSD disks, increasing access speed by more than 50%. Historical emails and large attachments are automatically migrated to high-capacity cloud storage nodes, balancing storage capacity and access efficiency. In addition, each account is equipped with a 10GB shared cloud drive and a 50GB file transfer station. A single email can send 3GB of super large attachments. When used in conjunction with the transfer station, the total attachment volume can exceed 53GB at once, meeting the needs of enterprise large file transmission and data accumulation. All attachments are stored encrypted to ensure data security.

The high concurrency processing capability relies on multi-layer load balancing and elastic scaling technology, which can easily cope with sudden traffic shocks. The system adopts a multi-layer load balancing architecture of "access layer application layer data layer" to evenly distribute massive user requests to different nodes, avoiding single node overload; At the same time, it supports intelligent elastic expansion, which can automatically adjust server resources according to the peak of email sending and user growth rate, cope with sudden traffic such as holiday mass notifications and large conference emails, and ensure service stability does not decrease. In addition, the architecture has a built-in real-time monitoring system that can monitor the resource usage, port status, and email transmission of each node in real time. Once any abnormalities are detected, an alarm will be triggered immediately. Alibaba's professional operations team will respond quickly 24/7 to ensure the continuous and stable operation of the architecture. With 20 years of professional enterprise email operation experience, reliable email service support will be provided for enterprises.