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<p>Hello,<br>
</p>
<p>When using a sieve, there is no problem with duplicates, but it
is impossible to transfer all users to a sieve.<br>
</p>
<div class="moz-cite-prefix">10.09.2019 20:17, Francis via dovecot
пишет:<br>
</div>
<blockquote type="cite"
cite="mid:CAN8txGCmzV_Hn7XOt6Xryx7EZ3ph95_96CaPUnrNXC_hCzFCtw@mail.gmail.com">
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<div dir="ltr">Le lun. 9 sept. 2019 à 12:08, Francis <<a
href="mailto:francisd@gmail.com" moz-do-not-send="true">francisd@gmail.com</a>>
a écrit :<br>
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<div class="gmail_quote">
<blockquote class="gmail_quote" style="margin:0px 0px 0px
0.8ex;border-left:1px solid
rgb(204,204,204);padding-left:1ex">
<div dir="ltr">Hello,
<div><br>
</div>
<div>I migrated our mail infrastructure to Dovecot on
Ubuntu 18.04 some months ago. It works fine, but
recently some users told me that they sometime receive
duplicated emails. Same email content, same headers
including message-id.</div>
<div><br>
</div>
<div>I'm using two dovecot servers on two sites. Both
server are in cluster. We don't use shared folders. All
users that reported this issue so far are using the same
server instance. The problematic emails are coming from
local users on that instance too. The examples they
given to me was emails with many recipients (To/CC). A
specific message can be received twice (or more) by
recipient A but only once by recipient B. I didn't see
anything in the logs about sieve rules that redirect
emails to others recipients.</div>
<div><br>
</div>
<div>Where should I look to diagnostic this issue?</div>
<div><br>
</div>
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</blockquote>
<div><br>
</div>
<div>Hello,</div>
<div><br>
</div>
<div>Thanks for your hints. The message from Битус Павел in
another thread today seem to be similar to my problem. I
asked my users if the affected messages are processed by a
local rules in Thunderbird and they said yes. I asked them
to replaces theirs local rules by sieve rules instead. We'll
see if it fixes the problem.</div>
<div><br>
</div>
<div>Thanks!</div>
<div><br>
</div>
<div>-- <br>
Francis</div>
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</blockquote>
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