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Edge Transport Server is a key component handling email flow at network boundaries, responsible for security filtering, routing, and transmission, enhancing email system security and efficiency, widely used in enterprise email systems.

Email archiving is a technical means for long-term, secure storage of emails and efficient management, meeting compliance, forensic, and information protection requirements.

Email gateway is the first line of defense for enterprise email systems, with functions including anti-spam, anti-virus, content review, and compliance auditing, ensuring secure and stable email communication.

Email quota is a storage limit set by email service providers to manage resources and ensure service stability. Users need to regularly clean up emails or upgrade accounts to avoid exceeding limits that affect sending/receiving emails and system performance.

Email relay is a critical component in electronic mail transmission, enabling server-to-server email forwarding through the SMTP protocol. Modern systems implement restricted relaying to enhance security, with widespread applications in enterprises, cloud services, and IoT. Future developments are moving toward intelligent and highly secure systems.

An email alias is an alternative address associated with a primary mailbox, facilitating categorized management, privacy protection, and unified brand image, suitable for efficient communication for both individuals and businesses.

Load balancing enhances system performance and availability by distributing traffic, supporting high concurrency and scalability scenarios, widely used in web clusters, cloud computing, and microservice architectures.

DNSSEC enhances DNS security through digital signatures, preventing domain spoofing and cache poisoning, ensuring users access genuine websites.

TTL (Time To Live) is a key concept in computer networking and electronic engineering, widely used in network protocols, domain name systems, integrated circuits, and cache management.

CNAME record is a resource record in DNS used to create domain aliases, widely applied in website hosting, CDN acceleration, and third-party service integration, enhancing domain management flexibility and efficiency.