Code words

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Anti-spam technique: Code words
Date of first use: early 1990s
Effectiveness: Medium
Popularity: Low
Difficulty of implementation: Low
Where implemented: MUA or manual
Harm: Low

Code words are a variant on tagged addresses that put the tag in the Subject: line.

They're most commonly used informally by people with addresses that get a great deal of both legitimate mail and spam, who say "put <word> in the subject line when you write" and use a simple MUA filter that looks for the word.

In principle this could be done per-sender and automated the same way as address tags, but it appears that nobody has done so.