Debug for "can't determine message sender"

From: Andrey Salnikov <>
Date: Fri, 24 May 2013 14:03:03 +0400


Its any way to debug "can't determine message sender" message?
I found dependence with mail client and getting "can't determine message
sender". All messages sent by Outlook isn't signed.
How I can grab headers from unsigned messages to fix this issue.

postfix 2.7.1
opendkim 2.6.8

Received on Fri May 24 2013 - 10:03:16 PST

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