OT - Finding/removing duplicate emails - WAS: Re: [Dovecot] dovecot/lmtp munmap()-ing a lot

Reindl Harald h.reindl at thelounge.net
Tue Jun 10 13:24:57 UTC 2014

Am 10.06.2014 15:17, schrieb Steffen Kaiser:
> On Tue, 10 Jun 2014, Charles Marcus wrote:
>> On 6/9/2014 5:44 PM, Ralf Hildebrandt <r at sys4.de> wrote:
>>> That's probably the problem here. The user had LOTS of (duplicate!)
>>> mails in his inbox.
>> Anyone ever found a reliable way to do this?
>> It sure would be nice if dovecot could perform this on a per account and/or per maildir/mailbox case with a
>> simple doveadm command...
> The basic question is: what is a duplicate?
> I spot 100% duplicates within the same Maildir mailbox with a script similiar to "fdupes"
> http://linux.die.net/man/1/fdupes .
> Because an user may copy messages around, I scan one mailbox at a time.
> For some rare cases, where I merge two accounts, I use a script, that looks for the message id in one account and
> removes all messages with the same id in the other account. Than I merge the Maildirs.
> However, neither script I would call general enough for automatic processing

dbmail has just "suppress_duplicates = yes" and silently ignores
*new received* messages with the same message-id to the same user
as a global setting

that's fine for people not able to handling a mailing-list
and hit reply-all every time

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