Jef,

> At log level2, I see some autolearn entries. I started with an empty
> logfile and used fetchmail to retrieve a pop3 mailbox with 278 messages
> (almost all spam). They are all correctly marked a spam.
> In the log, I see only 133 autolearn headers:
>   - autolearn=no: 103
>   - autolearn=spam: 1
>   - autolearn=ham: 0
>   - autolearn=unavailable: 29
> So there is not much learning happening, even with very high spam scores
> (20+ and even 30+).

Depends on your settings for bayes_auto_learn_threshold_nonspam and
bayes_auto_learn_threshold_spam, and on your other rules, plugins
and network tests, i.e. if spam usually collects high enough scores.
It may be normal. SA debugging can be turned on selectively, e.g:

 # amavisd -d bayes,learn debug-sa


> > [? [:AUTOLEARN] ||, autolearn=[:AUTOLEARN]]#
> I assume this is only necessary for showing entries at log level 0?

Yes.

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