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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.

DKIM Record is a key technology for email authentication that ensures the authenticity of email sources and integrity of content through digital signatures, enhancing email credibility, preventing forgery and tampering, and serving as an important means for enterprises to ensure email security.

DMARC record is an email authentication protocol that integrates SPF and DKIM to prevent email spoofing, enhancing email security and deliverability.

Exchange ActiveSync (EAS) is a mobile device synchronization protocol developed by Microsoft that supports email, calendar, contacts, and other data synchronization while providing security policy management, widely used in enterprise mobile office scenarios.

IMAP is a protocol used for synchronized management of electronic mail, supporting multi-device access and email status synchronization, widely used in modern mail services.

MAPI is a mail interface developed by Microsoft that supports email, calendar, and contact management. Once widely used in Windows platform mail systems, it is gradually being replaced by modern APIs but still plays a role in enterprise scenarios.

MIME is the foundational standard for transmitting non-text content in emails, supporting multilingual, multimedia, and structured messages, widely used in modern communications.