Similar to 正引きで確認された逆引きDNSエントリ

Gemini (protocol)

HMAC-based one-time password

InterPlanetary File System

Zero-configuration networking

Internet protocol suite

Multicast DNS

DNS over HTTPS

DNS over TLS

DNS-based Authentication of Named Entities

DNSCrypt

Email authentication

Bitmessage

Brand Indicators for Message Identification

DomainKeys Identified Mail

DMARC

POP before SMTP

S/MIME

Sender ID

Sender Policy Framework

DomainKeys

Bounce message

Backscatter (email)

Communication protocol