Static from address

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Anti-spam technique: Static from address
Date of first use: early 1990s
Effectiveness: Low
Popularity: High, built into many MUAs
Difficulty of implementation: easy
Where implemented: MUA or MTA
Harm: {{{harm}}}

Blacklisting senders was one of the earliest anti-spam techniques. It worked surprisingly well until spammers realized how easy it was to fake the addresses in mail headers and SMTP sessions.