Static subject keyword
From ASRG
| Anti-spam technique: Static subject keyword | |
|---|---|
| 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}}} |
Subject filters are popular, since large amounts of spam still is about things that rarely appears in legitimate mail, such as certain drugs, body parts, and implausible third-world military and financial stories.
They are easily subverted by euphemism or deliberate misspellings, e.g. v1@gra.
