dovecot - Aug 2016 - Problem with sieve configuration on dovecot+debian_jessie+ISPC3

I'm new-ish to dovecot and sieve (haven't used it extensively till now) 
and I'm not sure that I configured everything propperly.

The problem is that we're trying to get the following sieve code to run:

require ["fileinto", "regex", "date",
"relational", "vacation",
"duplicate"];



require "duplicate";
    if duplicate :header "message-id" {
      discard;
    }
     else
   {
redirect "<somemail1>";
redirect "<somemail2>";
redirect "<somemail3>";
redirect "<somemail4>";
redirect "<somemail5>";
redirect "<somemail6>";
keep;
}

keep;


But we're constantly getting the following error:

sieve: info: started log at Aug 02 08:13:21.
main script: line 5: error: require command: unknown Sieve capability 
`duplicate'.
main script: line 6: error: unknown test 'duplicate' (only reported once
at first occurence).
main script: error: validation failed.

Both me and my collegue can't find what's wrong with the system.

I would appreciate any kind of help on this matter.

Below's my configuration.

# dovecot --version
2.2.13

# dovecot -n
# 2.2.13: /etc/dovecot/dovecot.conf
# OS: Linux 2.6.32-45-pve x86_64 Debian 8.5
auth_mechanisms = plain login
disable_plaintext_auth = no
listen = *,[::]
log_timestamp = "%Y-%m-%d %H:%M:%S "
mail_privileged_group = vmail
managesieve_notify_capability = mailto
managesieve_sieve_capability = fileinto reject envelope 
encoded-character vacation subaddress comparator-i;ascii-numeric 
relational regex imap4flags copy include variables body enotify 
environment mailbox date ihave vnd.dovecot.duplicate
passdb {
   args = /etc/dovecot/dovecot-sql.conf
   driver = sql
}
plugin {
   quota = dict:user::file:/var/vmail/%d/%n/.quotausage
   sieve = /var/vmail/%d/%n/.sieve
   sieve_duplicate_default_period = 14d
   sieve_extensions = +vnd.dovecot.duplicate
   sieve_max_redirects = 6
   sieve_plugins = sieve_extprograms
}
protocols = imap pop3
service auth {
   unix_listener /var/spool/postfix/private/auth {
     group = postfix
     mode = 0660
     user = postfix
   }
   unix_listener auth-userdb {
     group = vmail
     mode = 0600
     user = vmail
   }
   user = root
}
service imap-login {
   client_limit = 1000
   process_limit = 500
}
ssl_cert = </etc/postfix/smtpd.cert
ssl_key = </etc/postfix/smtpd.key
ssl_protocols = !SSLv2 !SSLv3
userdb {
   args = /etc/dovecot/dovecot-sql.conf
   driver = sql
}
protocol imap {
   mail_plugins = quota imap_quota
}
protocol pop3 {
   mail_plugins = quota
   pop3_uidl_format = %08Xu%08Xv
}
protocol lda {
   mail_plugins = sieve quota
}

# uname -a
Linux fero 2.6.32-45-pve #1 SMP Wed Mar 30 12:22:08 CEST 2016 x86_64 
GNU/Linux

It's a Debain Jessie VM running ISPC3.

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On 2016-08-02 10:25, Filip Loncar [WarpMax | FederationServers] wrote:
> require "duplicate";
>    if duplicate :header "message-id" {
>      discard;
>    }
this sieve rule will discard your own postings on maillists when you get 
them back

bummer
> This e-mail, including all attached files, if any, is confidential and
this is a public maillist, no need to make a policy on that

please cut it down or remove it when you post to maillists

Well that's not a problem with the mailing list.

The problem is that I'm trying to do a forwarding system between 6 emails
that all have to receive each other's emails but without the duplicates.

So we have emails: A, B, C, D, E, and F; And whenever someone sends an
email to A; B, C, D, E, and F should receive the emails. But B
automatically forwards everything to A again, and to everyone else, etc. ad
infinitum. So I get a loop.

I'm trying to fix that all duplicates aren't forwarded to anyone else.
So
that people can put B, C, and E into the CC without getting duplicates.

Thanks in advance.

PS: Those were the experimental rules on the system, not this email.

On 5 August 2016 at 11:05, Benny Pedersen <me at junc.eu> wrote:
> On 2016-08-02 10:25, Filip Loncar [WarpMax | FederationServers] wrote:
>
> require "duplicate";
>>    if duplicate :header "message-id" {
>>      discard;
>>    }
>>
>
> this sieve rule will discard your own postings on maillists when you get
> them back
>
> bummer
>
> This e-mail, including all attached files, if any, is confidential and
>>
>
> this is a public maillist, no need to make a policy on that
>
> please cut it down or remove it when you post to maillists
>

Thunderbird shows this message as only a picture. Had to view the source 
to read it.
> I'm new-ish to dovecot and sieve (haven't used it extensively till
now)
> and I'm not sure that I configured everything propperly.
>
> The problem is that we're trying to get the following sieve code to
run:
[...]
> But we're constantly getting the following error:
>
> sieve: info: started log at Aug 02 08:13:21.
> main script: line 5: error: require command: unknown Sieve capability
> `duplicate'.
> main script: line 6: error: unknown test 'duplicate' (only reported
once
> at first occurence).
> main script: error: validation failed.
>
> Both me and my collegue can't find what's wrong with the system.
>
> I would appreciate any kind of help on this matter.
> Below's my configuration.
>
> # dovecot --version
> 2.2.13
That version is very old. I am not sure which Pigeonhole version Debian 
used with that. The standard "duplicate" extension was introduced
around
that time. It could be that it is still called "vnd.dovecot.duplicate"
at your end.

So, try `require "vnd.dovecot.duplicate";' instead of  `require 
"duplicate";'.


Regards,


Stephan.