Sv: Sv: Sv: Avoid duplicate emails in the sent folder

[André Rodier]

On Sun, 2021-04-04 at 14:31 +0200, Sebastian wrote:
> 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.
Thanks, I see this as the main issue

> 
> 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).

I continue to search on a simple solution, and I will come back to you!

> 
> -----Ursprungligt meddelande-----
> Från: dovecot-bounces at dovecot.org <dovecot-bounces at dovecot.org> För
> André Rodier
> Skickat: den 4 april 2021 14:10
> Till: Dovecot Mailing List <dovecot at 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-bounces at dovecot.org <dovecot-bounces at dovecot.org>
> > För 
> > André Rodier
> > Skickat: den 4 april 2021 13:57
> > Till: Dovecot Mailing List <dovecot at 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-bounces at dovecot.org <dovecot-bounces at dovecot.org>
> > > För 
> > > André Rodier
> > > Skickat: den 4 april 2021 12:48
> > > Till: dovecot at dovecot.org
> > > Kopia: users at 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
> > > 
> > > 
> 
>