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A bounce email (or bounce) refers to an email that cannot be delivered and is returned to the sender.

API integration connects different systems through application programming interfaces, enabling data sharing and automation, improving efficiency and user experience, becoming a key technology for enterprise digital transformation.

Backup and recovery are key measures to ensure data security and system availability, covering various backup types such as full, incremental, differential, and recovery methods including full-system, file-level, suitable for both personal and enterprise needs.

Delivery path tracking is a technique that records and displays the transmission path of emails by analyzing the ‘Received’ fields in email headers, used for troubleshooting email issues, detecting spam, optimizing network performance, and meeting compliance audit requirements.

DSN (Delivery Status Notification) is a standard mechanism in email systems for reporting mail delivery status, helping senders understand whether emails were successfully delivered, delayed, or failed, and including standardized status codes and error messages.

Send rate limiting is a security mechanism in email systems that controls the number of emails sent within a time period to prevent spam, protect server stability, and improve email delivery quality.

A Service Level Agreement (SLA) is a formal agreement between service providers and customers that clarifies service quality, responsibility allocation, and compensation for breaches, widely used in IT, cloud computing, telecommunications, and other fields to enhance service transparency and customer satisfaction while protecting the interests of both parties.

发件人信誉是邮件系统评估发件人可信度的机制，影响邮件送达与安全。

监控告警是通过技术手段实时监测系统状态并在异常时触发通知的运维方式，保障系统稳定性与可用性。

Email classification tags are important tools for improving email management efficiency, enabling categorization, filtering, and priority sorting through automatic or manual labeling.