All the stuff about duplicates, and duplicate suppression can be real confusing, and 
so let me try and straighten some of it out.

In the sendmail world, duplicate delivery supression means that a single message wont 
be delivered multiple times to the same addressee. Thus, if I mail to two aliases on 
the same system, and these aliases are really exploder lists, and your in both lists, 
you won't get two copies.  In Cyrus, duplicate delivery suppression is really single 
instance store, meaning if a message is received for 50 people at your site, the 
message will only be written to disk once, and there will be 50 hard links (all 50 
copies of the message will be the same inode, meaning really only one copy).

What your talking about is a case where, as in this reply, I am mailing 
to the discussion list and CC'ing you.  Two separate mail message arrive at your 
machine.  If you look at the headers, they are different.  One went directly from my 
mail server to yours.  The other came to you from the listserv at cmu.edu.  As far as 
sendmail and as far as cyrus-imapd are concerned, those are two separate messages, and 
duplicate suppression does not apply.

Hope that helps.

-- Rob


--On Friday, February 02, 2001 09:58:54 PM +0100 Timo Pröscholdt <[EMAIL PROTECTED]> 
wrote:

> Hi Cyrus Users,
>
> many questions from me these days. I hope
> not to beginn to go on your nerves.
>
> Today my problem is the following.  Mail which is sent to me twice,
> example a reply mail from one of you answering me, send
> directly to me and a cc to the list which i am subscribed
> to, reaches me only one time. It is delivered to my INBOX
> but the mail is mising in my (sieve filtered)
> info-cyrus-mailbox where all the other mails from the list
> appear.
> I read about the Duplicate Delivery Suppression feature
> of cyrus but im not sure if that is the point because mail
> from me to multiple persons on this mailserver (same partition)
> reaches each of the recipients, while a mail from: me to: me cc: me
> reaches me only one time!
>
> Im running cyrus 2.07 on, linux 2.2.14
>
> feature or bug
>
> greetings
> timo proescholdt
>
>




       _ _ _ _           _    _ _ _ _ _
      /\_\_\_\_\        /\_\ /\_\_\_\_\_\
     /\/_/_/_/_/       /\/_/ \/_/_/_/_/_/  QUIDQUID LATINE DICTUM SIT,
    /\/_/__\/_/ __    /\/_/    /\/_/          PROFUNDUM VIDITUR
   /\/_/_/_/_/ /\_\  /\/_/    /\/_/
  /\/_/ \/_/  /\/_/_/\/_/    /\/_/         (Whatever is said in Latin
  \/_/  \/_/  \/_/_/_/_/     \/_/              appears profound)

  Rob Tanner
  UNIX and Networks Manager
  Linfield College, McMinnville OR
  (503) 434-2558 <[EMAIL PROTECTED]>

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