[Dovecot] How do I test if the anti spam plugin is working?

[Dr Josef Karthauser]

I've configured the dspam anti spam plugin, but it doesn't appear to be doing 
anything when I move mail between mailboxes. Can anyone help me determine 
what's going on?

The plugin appears to be loading; at least if I don't define all the required 
configuration options I get a complaint in the log file. But beyond that I 
don't see any activity.

Here's the config:

        babel# dovecot --version
        2.1.3

The dovecot anti spam plugin config is:

        protocol imap {
                  mail_plugins = $mail_plugins antispam
        }

and

        plugin {
            antispam_debug_target = syslog
            antispam_verbose_debug = 1

            antispam_backend = dspam
            antispam_signature = X-DSPAM-Signature

            antispam_signature_missing = error

            antispam_trash_pattern_ignorecase = trash;Deleted *
            antispam_spam_pattern = SPAM

            antispam_dspam_binary = /usr/local/bin/dspam

            antispam_dspam_args = --deliver=;--user;%n@_%d
        }

I don't even appear to be seeing any log entries from the plugin.

I've moving an email from my main mailbox into a mailbox called 'SPAM', which 
is how I thought that it was supposed to be triggered.

Cheers,
Joe