Similar to SMTPS
MIME
MIMEQuoted-printable
Quoted-printableSTARTTLS
Opportunistic TLSDatagram Congestion Control Protocol
Datagram Congestion Control ProtocolApplication-Layer Protocol Negotiation
Application-Layer Protocol NegotiationDatagram Transport Layer Security
Datagram Transport Layer SecurityBase64
Base64DKIM
DomainKeys Identified MailExchange ActiveSync
Exchange ActiveSyncPost Office Protocol
Post Office ProtocolSender Policy Framework
Sender Policy FrameworkSMTP
Simple Mail Transfer ProtocolUTF-7
UTF-710.5インチiPad Pro
Exterior Gateway Protocol
Exterior Gateway ProtocolBinHex
BinHexBorder Gateway Protocol
Border Gateway ProtocolCAST-128
CAST-128CAST-256
CAST-256Collaborative real-time editor
Collaborative real-time editorComma-Separated Values
Comma-separated valuesCommon Management Information Protocol
Common Management Information ProtocolDIAMETER
Diameter (protocol)Endpoint Handlespace Redundancy Protocol
Endpoint Handlespace Redundancy ProtocolExtended Validation 証明書
Extended Validation Certificate.eg
.eg.tz
.tz0.0.0.0
0.0.0.0