...
Previous version implementation
In 3.3, the plugin is not loaded by default.
In 3.1, it is a plugin, loaded by default in the file v310.pre
.
...
It seems to me that this would be the place to document the default value of auto_whitelist_factor. I gather from other sources that it's 0.5. – DanielNorton
Yes, the default auto_whitelist_factor is indeed 0.5, as described in the documentation at Mail::SpamAssassin::Plugin::AWL auto_whitelist_factor. – Adam Katz
As to how it faces users, the description can be overridden in the configuration. My (Adam Katz) production systems redescribe AWL so as to remove the confusion:
describe AWL Adjust score towards average for this sender