imapsieve wrong matches on APPEND cause

Hello,

I'm experiencing some strange problem with imapsieve mailbox rules matching. I have Ubuntu Server 18.04.1 LTS with Postfix 3.3.0, Dovecot 2.2.33.2 and Rspamd 1.7.9. The problem occurs with Microsoft Outlook 2016 mail client. When moving with Outlook, APPEND event is logged instead of MOVE. However, when moving with another client, MOVE event is logged.

So without APPEND event in causes in plugin section of dovecot.conf no rule is matched at all. If I add APPEND event into causes in plugin section of dovecot.conf, then for some reason imapsieve matches both rules on move from Inbox to Spam and no rules on move from Spam to Inbox. Matching both rules attempts to run both learn_spam and learn_ham. First one works and second logs error (which is correct). On attempt to move message from Spam to Inbox imapsieve not matching any rule at all and thus learning is not working.

Could you please let me know how to fix this?

More details. Here is what I have in my plugin section of dovecot.conf: ---------------------------------------- %<

plugin { imapsieve_mailbox1_before = file:/var/vmail/sieve/global/learn-spam.sieve imapsieve_mailbox1_causes = COPY APPEND imapsieve_mailbox1_from = Inbox imapsieve_mailbox1_name = Spam imapsieve_mailbox2_before = file:/var/vmail/sieve/global/learn-ham.sieve imapsieve_mailbox2_causes = COPY APPEND imapsieve_mailbox2_from = Spam imapsieve_mailbox2_name = Inbox sieve = file:/var/vmail/sieve/%d/%n/scripts;active=/var/vmail/sieve/%d/%n/active-scr ipt.sieve sieve_before = /var/vmail/sieve/global/spam-global.sieve sieve_global_dir = /var/vmail/sieve/global/ sieve_global_extensions = +vnd.dovecot.pipe +vnd.dovecot.environment +vnd.dovecot.debug sieve_pipe_bin_dir = /usr/bin sieve_plugins = sieve_imapsieve sieve_extprograms } ---------------------------------------- %<

I also have Trash, Drafts, Sent and Spam mailboxes defined in dovecot.conf. So when I try to move actual spam message from Inbox to Spam folder, this is what I see in dovecot.log: ---------------------------------------- %<

Debug: imapsieve: mailbox Spam: APPEND event ---------------------------------------- %<

So before I added "APPEND" into above imapsieve_mailbox1_causes and imapsieve_mailbox2_causes imapsieve was not matching rules at all. But after I added APPEND, here is what happens. In case I move message from Inbox to Spam both rules are matched and dovecot attempts to run both rules: ---------------------------------------- %<

Debug: INBOX: Mailbox opened because: SELECT Debug: Spam: Mailbox opened because: SELECT Debug: imapsieve: mailbox Spam: APPEND event Debug: sieve: Pigeonhole version 0.4.21 (92477967) initializing Debug: sieve: Sieve imapsieve plugin for Pigeonhole version 0.4.21 (92477967) loaded Debug: sieve: Sieve Extprograms plugin for Pigeonhole version 0.4.21 (92477967) loaded Debug: imapsieve: Static mailbox rule [1]: mailbox=Spam' from=*' causes=(APPEND) => before=file:/var/vmail/sieve/global/learn-spam.sieve' after=(none) Debug: imapsieve: Static mailbox rule [2]: mailbox=*' from=Spam' causes=(APPEND) => before=file:/var/vmail/sieve/global/learn-ham.sieve' after=(none) Debug: imapsieve: Matched static mailbox rule [2] Debug: imapsieve: Matched static mailbox rule [1] Debug: sieve: file storage: Using Sieve script path: /var/vmail/sieve/global/learn-spam.sieve Debug: sieve: file script: Opened script learn-spam' from /var/vmail/sieve/global/learn-spam.sieve' Debug: sieve: file storage: Using Sieve script path: /var/vmail/sieve/global/learn-ham.sieve Debug: sieve: file script: Opened script learn-ham' from /var/vmail/sieve/global/learn-ham.sieve' Debug: sieve: Opening script 1 of 2 from /var/vmail/sieve/global/learn-spam.sieve' Debug: sieve: Loading script /var/vmail/sieve/global/learn-spam.sieve Debug: sieve: Script binary /var/vmail/sieve/global/learn-spam.svbin successfully loaded Debug: sieve: binary save: not saving binary /var/vmail/sieve/global/learn-spam.svbin, because it is already stored Debug: sieve: Executing script from /var/vmail/sieve/global/learn-spam.svbin' Debug: sieve: action pipe: running program: rspamc Debug: Mailbox Spam: Opened mail UID=12 because: mail stream Debug: waiting for program /usr/bin/rspamc' to finish after 0 msecs Debug: sieve: Opening script 2 of 2 from /var/vmail/sieve/global/learn-ham.sieve' Debug: sieve: Loading script /var/vmail/sieve/global/learn-ham.sieve Debug: sieve: Script binary /var/vmail/sieve/global/learn-ham.svbin successfully loaded Debug: sieve: binary save: not saving binary /var/vmail/sieve/global/learn-ham.svbin, because it is already stored Debug: sieve: Executing script from `/var/vmail/sieve/global/learn-ham.svbin' Debug: Spam: Mailbox opened because: lib-lda delivery Debug: Spam: Mailbox opened because: SELECT ---------------------------------------- %<

And of course I'm getting the following in the log file: ---------------------------------------- %<

Error: sieve: learn-ham: line 2: duplicate pipe "rspamc" action not allowed (previously triggered one was here: learn-spam: line 3) Error: sieve: Execution of script /var/vmail/sieve/global/learn-ham.sieve failed ---------------------------------------- %<

In case I move message from Spam to Inbox on rule is matched at all: ---------------------------------------- %<

Debug: INBOX: Mailbox opened because: SELECT Debug: imapsieve: mailbox INBOX: APPEND event Debug: sieve: Pigeonhole version 0.4.21 (92477967) initializing Debug: sieve: Sieve imapsieve plugin for Pigeonhole version 0.4.21 (92477967) loaded Debug: sieve: Sieve Extprograms plugin for Pigeonhole version 0.4.21 (92477967) loaded Debug: imapsieve: Static mailbox rule [1]: mailbox=Spam' from=*' causes=(APPEND) => before=file:/var/vmail/sieve/global/learn-spam.sieve' after=(none) Debug: imapsieve: Static mailbox rule [2]: mailbox=*' from=Spam' causes=(APPEND) => before=file:/var/vmail/sieve/global/learn-ham.sieve' after=(none) Debug: INBOX: Mailbox opened because: SELECT ---------------------------------------- %<

With best regards, Alex