[CentOS] No envelope information

hi,

have installed centos 4.7

We have installed qmail + simscan + vpopmail + SpamAssassin + clanAV
and when we send a mail from a particular domain, the following error leaves us


simscan: no envelope information, deferred exit

and checking our log shows me the following 

2009-09-14 18:18:06.929624500 16910 < Received: from mail pickup service by cp197.mysite4now.com with Microsoft SMTPSVC;

2009-09-14 18:18:06.929631500 16910 <             Mon, 14 Sep 2009 15:14:25 -0700

2009-09-14 18:18:06.929635500 16910 < thread-index: Aco1iLhSamfTCiVGQWqn8JicKvfRZQ==

2009-09-14 18:18:06.929639500 16910 < Thread-Topic: Encuesta de clima laboral

2009-09-14 18:18:06.929642500 16910 < From: <gptw at gptwperu.com.pe>

2009-09-14 18:18:06.929646500 16910 < To: <jmarin at enlace+

2009-09-14 18:18:06.929650500 16910 < aduanero.com.pe>
2009-09-14 18:18:06.929727500 16910 < Subject: Encuesta


 I wonder if this problem can be for Centos 4.7 or which would be the problem.


Greetings

Luis


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