Also another important thing to take in consideration: An email that is sent outgoing from an SMTP server, isn't a exact copy of the email put into the SMTP server. Thats why a deduplicate program/command/filter won't work, as the 2 emails aren't 100% identical.
The 2 "duplicates" arent technically 100% identical. Thats why the only
solution is to prevent the IMAP client from writing new "unknown" emails into
the Sent folder, and then instead use a separate folder for importing emails
across accounts (from which you then COPY/MOVE emails from internally in the
same acount, to the Sent folder).
-----Ursprungligt meddelande-----
Från: dovecot-boun...@dovecot.org <dovecot-boun...@dovecot.org> För André Rodier
Skickat: den 4 april 2021 14:10
Till: Dovecot Mailing List <dovecot@dovecot.org>
Ämne: Re: Sv: Sv: Avoid duplicate emails in the sent folder
Hello Sebastian,
On Sun, 2021-04-04 at 14:00 +0200, Sebastian wrote:
> Thats why you need the exim4 filter too.
I obtained the exact same result with postfix, using +Sent and a sieve filter.
Sent emails are automatically bcc'ed to the user, using the
+Sent email address.
However, I still want to be able to drag and drop emails to the sent folder,
which unfortunately uses the APPEND verb.
Also, there is a mail import wizard that import emails from gmail/yahoo/etc,
and there the verb used is APPEND.
I am now investigating the doveadm deduplicate program.
Kind regards,
André
> Because, my version basically prohibits the IMAP client from writing
> to the Sent folder at all, and gives that job to the SMTP server
> instead.
> Works perfectly for me, all sent emails gets into the sent folder
> without any hitch.
>
> Without any duplicates since no IMAP client is permitted to write into
> the Sent folder.
>
> Note that only APPEND should be specifyed, not COPY, meaning that if
> you COPY from the same IMAP account to Sent folder, it will be
> permitted, but if you APPEND (write a new email) to the Sent folder,
> it will get auto-deleted.
>
> -----Ursprungligt meddelande-----
> Från: dovecot-boun...@dovecot.org <dovecot-boun...@dovecot.org> För
> André Rodier
> Skickat: den 4 april 2021 13:57
> Till: Dovecot Mailing List <dovecot@dovecot.org>
> Ämne: Re: Sv: Avoid duplicate emails in the sent folder
>
> Thanks, Sebastian.
>
> I just tried this, but it is working too well.
>
> If I want to import emails from another Sent folder, using drag & drop
> from my email client, the emails are deleted in the background.
>
> This is why I am trying to use the duplicate filter.
>
> Kind regards,
> André Rodier
>
> On Sun, 2021-04-04 at 13:04 +0200, Sebastian wrote:
> > I have a sieve filter called "sent.sieve"
> >
> > Where I just do this:
> > discard;
> >
> > Then in sieve settings:
> >
> > plugin {
> > sieve_plugins = sieve_imapsieve sieve_extprograms
> > sieve_global_extensions = +vnd.dovecot.execute
> > sieve_execute_bin_dir = /usr/bin/
> > imapsieve_mailbox2_name = Sent
> > imapsieve_mailbox2_causes = APPEND
> > imapsieve_mailbox2_before = file:/etc/dovecot/sieve/sent.sieve
> > imapsieve_expunge_discarded=yes
> > }
> >
> >
> > And then in Exim4 SMTP server:
> >
> >
> > sentfolder.filter:
> > if $sender_address_domain is sebbe.eu then unseen save
> > /var/mail/asterisk2/Sent endif
> >
> > in exim4 config:
> > system_filter = /etc/exim4/sentfolder.filter
> > system_filter_file_transport = sentfolder
> >
> > in transports of exim4.conf:
> >
> > sentfolder:
> > debug_print = "T: Sentfolder for $local_part@$domain"
> > headers_add = Status: RO
> > headers_remove = x-dkim-signature
> > headers_remove = x-spf-signature
> > headers_remove = x-trusted-domain
> > headers_remove = keywords
> > headers_remove = x-priority
> > headers_remove = x-status
> > driver = appendfile
> > delivery_date_add
> > envelope_to_add
> > return_path_add
> > use_flock_lock = yes
> > use_fcntl_lock = no
> > use_lockfile = no
> > group = mail
> > mode = 0777
> > mode_fail_narrower = false
> > current_directory = /
> >
> >
> >
> > that should solve it.
> >
> > -----Ursprungligt meddelande-----
> > Från: dovecot-boun...@dovecot.org <dovecot-boun...@dovecot.org> För
> > André Rodier
> > Skickat: den 4 april 2021 12:48
> > Till: dovecot@dovecot.org
> > Kopia: us...@sogo.nu
> > Ämne: Avoid duplicate emails in the sent folder
> >
> > Hello,
> >
> > I have a webmail program, that I cannot configure to not save sent
> > emails in the Sent folder. My emails to the SOGo team don't seem to
> > reach the mailing list anymore.
> >
> > So, I have no other choice to think the problem differently, and
> > _maybe_ use Dovecot to fix this issue. Moreover, I think this could
> > be useful for other email clients.
> >
> > First, I have tried to use Sieve, but no success so far:
> >
> > ------
> > imapsieve_mailbox4_name = *
> > imapsieve_mailbox4_from = Sent
> > imapsieve_mailbox4_causes = APPEND, COPY
> > imapsieve_mailbox4_after = file:/var/lib/dovecot/sieve/sent-
> > checks.sieve
> > ------
> >
> > And this sieve script:
> >
> > ------
> > Message-ID header.
> > require [
> > "variables",
> > "environment",
> > "duplicate",
> > "imapsieve"
> > ];
> >
> > […]
> >
> > if duplicate :seconds 10 {
> > discard;
> > }
> > ------
> >
> > Otherwise, can I configure dovecot in a certain way, for instance
> > create a virtual Sent folder. This would not save the email when
> > appended, but still returns the list of sent emails ?
> >
> > But this is not working. Any idea?
> >
> > Thanks for your help!
> >
> > André
> >
> >
>
>
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