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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.

POP3 is a classic protocol for receiving emails, supporting download and local management, suitable for single-device users.

SMTP is the core protocol for email transmission, defining communication rules between email clients and servers as well as server-to-server communication. It has undergone extensions and security enhancements while continuing to support modern email systems.

SPF record is an email authentication mechanism that declares which servers can send emails through DNS records, preventing forgery and spam, improving email security and delivery rates.

TXT records are resource records in DNS that store text information, used for SPF verification, domain ownership confirmation, and security policy declarations.

HTTP and HTTPS are fundamental protocols for Webmail services. HTTPS ensures communication security through encryption, preventing data leaks and attacks, and has become the standard for modern web services.