Similar to バウンスメール

S/MIME

DomainKeys

Backscatter (email)

AOL Mail

Distributed Sender Blackhole List

Exterior Gateway Protocol

Border Gateway Protocol

Diameter (protocol)

Endpoint Handlespace Redundancy Protocol

Email authentication

Bitmessage

DomainKeys Identified Mail

DMARC

POP before SMTP

Sender ID

Sender Policy Framework

Forward-confirmed reverse DNS

Email

Internet abuse

Biff (Unix)