plugin {

  imapsieve_mailbox1_before = file:/usr/local/etc/dovecot/sieve/report-spam.sieve

  imapsieve_mailbox1_causes = COPY APPEND

  imapsieve_mailbox1_name = Spam

  imapsieve_mailbox2_before = file:/usr/local/etc/dovecot/sieve/report-ham.sieve

  imapsieve_mailbox2_causes = COPY

  imapsieve_mailbox2_from = Spam

  imapsieve_mailbox2_name = *

}

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I see that the static rule ought to have matched,

 

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Mar 19 16:21:48 mhv3 dovecot[47532]: imap(steve)<47541><ROnt+uu9idkYgsde>: Debug: imapsieve: mailbox INBOX: APPEND event

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For INBOX (or * in your case) you only have COPY from Spam configured, not APPEND.

APPENDing to Spam should trigger the relevant script though.

If you want to enable ham training by uploading a message to INBOX you could add a third rule mentioning INBOX by name with APPEND as cause.