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.
