Like, I assume, many people, I have the following in the /etc/procmailrc:
# Drop duplicates
:0:/var/tmp/.duplicate.lock
* ? formail -D 8192 $HOME/.duplicate.procmail-cache
/var/tmp/mail-duplicates
to get rid of multiple instances of the same message.
There is one problem with people who use a Microsoft mailer (headers
hereunder, they said it is Internet Explorer Mail). It seems that *all*
the messages coming from one site always have the same Message-ID, even
whent sent by different people! So they all end in the duplicates
folder...
Does anyone know how to fix that? (I really need the "duplicates
elimination" feature.)
Headers of the offending messages. On different messages, the Message-ID is
identical:
Received: from unknown (HELO inconnu) (10.1.1.65)
by my.domain.name with SMTP; 29 Aug 1997 16:09:03 -0000
Message-id:
<MAPI(_dot_)Id(_dot_)0016(_dot_)006d6572636965633030303930303039(_at_)MAPI(_dot_)to(_dot_)RFC822>
Priority: Normal
X-msmail-priority: Normal
X-priority: 3
Mime-version: 1.0
Old-date: Fri, 29 Aug 97 18:07:21 PDT
Content-type: text/plain; charset="ISO-8859-1"; X-MAPIextension=".TXT"
Content-transfer-encoding: 7bit