This is a more zimbra-specific version of the same instructions:
Spamassassin postfix authenticated users - Zimbra :: Wiki
Note at the end you must restart amavis. Actually if this doesn't produce results, I would try restarting zimbra.
Note that 6.0.5 already has the smtpd_sasl_authenticated_header setting, see
https://bugzilla.zimbra.com/show_bug.cgi?id=12277
And it looks to me that 6.0.5 also automatically hides the authenticated sender info. Compare 5.0.x:
Quote:
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Received: from [192.168.1.103] (75-101-0-254.dsl.dynamic.sonic.net [75.101.0.254]) (Authenticated sender: ewilen@mprinc.com) by zimbra.mprinc.com (Postfix) with ESMTP id DF0E53658776 for <ewilen@mprinc.com>; Fri, 7 Aug 2009 08:52:29 -0700 (PDT)
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6.0.5:
Quote:
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Received: from [192.168.1.101] (75-101-0-254.dsl.dynamic.sonic.net [75.101.0.254]) by zimbra.mprinc.com (Postfix) with ESMTPSA id 3648B2D60001 for <ewilen@mprinc.com>; Sat, 27 Mar 2010 08:43:10 -0700 (PDT)
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