On 03/20/2015 05:29 PM, Marco Stoecker wrote:
On 03/20/2015 05:12 PM, Mark Sapiro wrote:
On 03/20/2015 08:42 AM, Marco Stoecker wrote:
Mar 18 22:16:43 hostname postfix/smtpd: 6D42445B: client=localhost[::1] Mar 18 22:16:43 hostname postfix/cleanup: 6D42445B: message-id=5509EB1C.email@example.com
OK. This message was received from something on localhost (IPv6 [::1] at 22:16:43 and delivered to all the Mailman list recipients.
Mar 18 22:16:47 hostname postfix/qmgr: 6D42445B: removed
and for grep 4ACCAD07:
Mar 18 22:16:46 hostname postfix/smtpd: 4ACCAD07: client=localhost[::1] Mar 18 22:16:46 hostname postfix/cleanup: 4ACCAD07: message-id=5509EB1C.firstname.lastname@example.org
And then 3 seconds later something on the same host delivered a second copy to Postfix which delivered that to the lists also.
So this duplication occurred before Mailman and even before Postfix delivering to Mailman. It could be anything. You could try grepping the log for the Message-ID and see if that gives a clue.
Look for an original arrival being passed to some process that returns two copies.
I also use clamav-milter and spamassassin-milter together with postfix, maybe ones of these is the root cause. Thx for your detailed help. I think for Mailman this is solved, cause it has nothing to do with it.
I see a pattern now, when duplicates occur and it may have to do with mailman. If someone in a list send an email to two or three lists on the same server, the recipients of the list will get two or three times the same email. If it is sent to one list only, no duplicate occur. Any glue what the root cause could be?