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I am getting huge amount of these in my mail log, and unable to find its originator. What could be the reason? Here is log entry:

postfix/cleanup[9626]: 4413082E40: message-id=<>
postfix/qmgr[9367]: 4413082E40: from=<>, size=255, nrcpt=1 (queue active)
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Have you added or changed anything recently? If things like content_filters, or milters are not functioning correctly, you can see errors similar to this. – NickW Feb 20 '14 at 10:49
nothing changed – Farhan Feb 20 '14 at 10:55
Can you grep out all examples of that message-id ? – NickW Feb 20 '14 at 11:25
@Farhan : Mmmh... looks like two different process with different purposes log the message they handle one time each. Splitting the log of "cleanup" and "qmgr" can be temporary workaround. – user2284570 May 3 '14 at 11:22

The double-bounce messages are used by postfix for address verification.

You may find more detail here...

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