windows 2003 pop3 service

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hi,
we are using windows 2003 as a domain controller and further more we used
it as a mail server also.we are using pop3 service for intranet mails .we
have more than 80 mail box.all are working fine but from some times we are
facing some problem that we received a mail where sender address is not
mention, sender field is blank where as cc and To field are full of
receipient address .can u tell who is sending these messages to me and
others by which email id. how can i trace the sender email id or the
ipaddress of workstation from which they had sent.
.

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