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Backscatter (email)

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S/MIME

Sender ID

DomainKeys

Bounce message

Opt-in email

Email spam

Email marketing

Bitmessage

DomainKeys Identified Mail

DMARC

POP before SMTP

Sender Policy Framework

Forward-confirmed reverse DNS

Email

Internet abuse

AOL Mail

Biff (Unix)

Distributed Sender Blackhole List

GNU Mailman