real duplicates of some e-mails / dovecot-2.3.19

[hi at zakaria.website]

On 2022-09-08 10:46, Götz Reinicke wrote:
> Hi,
> 
> we have the issue, that some(!) e-mails we receive are duplicated when 
> processed by dovecot and stored to the users inbox.
> 
> The mails are binary identical, same message ID, same size etc. diff 
> sees no difference ….
> 
> For now we only see that it happens do small mails max. +- 5k in size.
> 
> And in dose not happen for all mails, but some are spam, some are 
> internal mails some are newsletter which are expected…. and it happens 
> for different users.
> 
> Dose anyone have/had a similar issue?
> 
> Any suggestion or idea would be helpful. Thanks . Götz

Hi Götz,

I've not had any similar experience but I thought perhaps to suggest if 
you try to analyse the dovecot and mail transfer agent logs when such 
email arrives and try to find what happens? It could be a sieve script 
copying emails to the recipient or something wrong in the MTA 
configurations that has nothing to do with Dovecot!

Zakaria.