Similar to Sender_Policy_Framework
DKIM
DomainKeys Identified Mail
Sender Policy Framework
Sender Policy Framework
送信ドメイン認証
Email authentication
DMARC
DMARCOpenPGP
POP before SMTP
POP before SMTP
S/MIME
S/MIMESMTP-AUTH
ドメインキー
DomainKeys
Multipurpose Internet Mail Extensions
MIME
Post Office Protocol
Post Office Protocol
Quoted-printable
Quoted-printable
Simple Mail Transfer Protocol
Simple Mail Transfer Protocol
SMTPS
SMTPS
UTF-7
UTF-7Bitmessage
Bitmessage
Inbound Port 25 Blocking
Outbound Port 25 Blocking
Sender ID
Sender ID
SMTP認証
バウンスメール
Bounce message
バックスキャッター (電子メール)
Backscatter (email)
正引きで確認された逆引きDNSエントリ
Forward-confirmed reverse DNS
Base64
Base64Exchange ActiveSync
Exchange ActiveSync
Internet Message Access Protocol
Internet Message Access ProtocolJSON Meta Application Protocol
JSON Meta Application Protocol
Messaging Application Programming Interface
MAPI