remove duplicate emails

[hi at zakaria.website]

On 2022-04-05 10:42, Jean-Max Reymond wrote:
> Le 05/04/2022 à 09:16, Aki Tuomi a écrit :
>> 
>>> On 04/04/2022 13:44 Jean-Max Reymond <jmreymond at ik.me> wrote:
>>> 
>>>   Hi,
>>> I have postfix running and sometimes and I have some duplicate emails
>>> with the same Message-ID.
>>> With dovecot sieve, I understand that duplicate option remove these
>>> emails but I don't understand the configuration to apply.
>>> Thanks for your tips,
>>> 
>> 
>> Hi!
>> 
>> you can remove existing duplicates with `doveadm deduplicate` command.
>> 
>> Aki
> 
> Thanks for your answer but I want to delete from the incoming mail 
> stream.
> 
> I have improved my configuration and now, I have
> 
> plugin {
>   sieve = ~/.dovecot.sieve
>   sieve_default = /var/lib/dovecot/sieve/default.sieve
>   sieve_dir = ~/sieve
>   sieve_trace_debug = yes
>   sieve_trace_dir = /var/log/sieve.log
> }
> 
> and
> # cat /var/lib/dovecot/sieve/default.sieve
> require ["duplicate", "fileinto", "mailbox"];
> 
> if duplicate {
>   fileinto :create "Trash/Duplicate";
> }
> 
> but I have always duplicate emails.

It could be due to a misconfigurationa in the MTA, perhaps you need to 
check your routers and transports if you were using EXIM, as it doesn't 
seem to be an expected result, to always have duplicate emails, isn't?