Email Encyclopedia

OAuth 2.0 is a widely used open authorization protocol that allows users to authorize third-party applications to access their resources without sharing credentials, ensuring security while enabling flexible authorization.

S/MIME is a public key encryption-based email security protocol that provides encryption, signature, and authentication functions to ensure the security and reliability of email communications.

TLS/SSL is an encryption protocol that ensures network communication security by establishing encrypted channels to achieve data confidentiality, integrity, and authentication, widely used in HTTPS, email, VPN, and other fields.

Two-Factor Authentication (2FA) enhances account security through password plus verification code or biometric authentication, widely used in finance, government services, and other sectors, effectively preventing risks from password leaks.

Virus scanning is a technical method for detecting and removing computer viruses and malicious software, safeguarding system security through signature detection, heuristic analysis, and other methods.

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.

PTR records are the key mechanism for implementing reverse DNS lookups in DNS, used to map IP addresses back to domain names, playing an important role in email verification, network security, and log analysis.

An A record is a basic record type in DNS that resolves domain names to IPv4 addresses, supporting website access, load balancing, failover, and other functions, serving as a key component of internet communication.

AAAA records are resource records in DNS used to resolve domain names to IPv6 addresses, forming an important part of IPv6 adoption.

CalDAV is a standard protocol based on WebDAV, used to implement cross-platform, cross-device calendar data synchronization and sharing, supporting event management, multi-user collaboration, permission control, and other functions, widely applied in mainstream calendar services.