[Dovecot] New deduplicate doveadm command - was Re: v2.2.4 released

[Reindl Harald]

Am 25.06.2013 15:28, schrieb Timo Sirainen:
> Also there are several potential problems.. Like if there are duplicate Message-ID: headers, 
> but the body is different, should that be a duplicate?

the answer is simply *yes* because there must not be the same
Message-ID's for different messages because the words "single
unique message identifier" are pretty clear
_______________________________________________________

RFC2822

   Though optional, every message SHOULD have a "Message-ID:" field.
   Furthermore, reply messages SHOULD have "In-Reply-To:" and
   "References:" fields as appropriate, as described below.

   The "Message-ID:" field contains a single unique message identifier.
   The "References:" and "In-Reply-To:" field each contain one or more
   unique message identifiers, optionally separated by CFWS.
_______________________________________________________

these days "every message SHOULD have a Message-ID:" is outdated

we started many years ago to block *any* message missing the
header because every sane SMTP implementation adds it if it
was missing from the client and so only broken implementations
which are mostly spammers would be affected

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