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

[Sebastian]

Aah yeah. A solution would be to create a folder, called Sent2.
Then you APPEND all emails into the Sent2 folder.

Then you COPY/MOVE all emails into the Sent folder.


What I have understand, your problem is that some clients (like webmail and certain email clients) write their own copy into the Sent folder, thus giving duplicates.
Thats why you completely disable APPENDing into the Sent folder.

Dragging and dropping has to be done with COPY/MOVE - which only happens if you Drag and drop from the very same IMAP account.
If you drag and drop from different email accounts, of course, from one account's perspective, you are reading a email and then DISCARD'ing it, and from the other account's perspective, you are APPENDing a completely new, unseen email.

Thats why I suggest creating a new Sent2 folder to transfer emails between accounts.
Then you use Sent2 to move into Sent folder.

-----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
> > 
> > 
> 
> 


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