That may or may not be true. Exchange 2003 leverages the SMTP service of the OS on which it is installed. All you can really tell from the banner is that this is a Windows 2000 SP4 box. (5.0.2195 = windows 2000, 6713 is the build number for SP4).
It could be either Exchange 2000 or 2003 running on windows 2000.
To determine the exchange version, you will need to examine the header of a message from that server.
Example:
Received: from US0104.company.com (localhost [127.0.0.1])
by eunuchs.company.com (8.9.1/8.9.1) with ESMTP id LAA11786
for <John.Fullbright@yetanothercompany.com>; Tue, 16 Aug 2005 11:40:51 -0700 (PDT)
Received: from US0101.company.com ([10.10.10.10]) by US0102.company.com with Microsoft SMTPSVC(5.0.2195.5329);
Tue, 16 Aug 2005 11:39:24 -0700
Content-class: urn:content-classes:message
MIME-Version: 1.0
Content-Type: multipart/mixed;
boundary="----_=_NextPart_001_01C5A291.D264B99E"
X-MimeOLE: Produced By Microsoft Exchange V6.5.7226.0
Subject: app logs for cls 1,2 & 3
Date: Tue, 16 Aug 2005 11:35:47 -0700
Message-ID: <CDF8085A0F53F44796430B8EA678598FD6D1@US0103.company.com>
X-MS-Has-Attach: yes
Thread-Topic: app logs for cls 1,2 & 3
Thread-Index: AcWikVGUnpFKW9XNQjSn9dFsirfn2w==
From: "Username" <user@company.com>
To: "Fullbright, John" <John.Fullbright@yetanothercompany.com>
X-OriginalArrivalTime: 16 Aug 2005 18:39:24.0789 (UTC)
The message originated on Exchange 2003 SP1 V6.5.7226.0 and passed through a routing bridgehead running Windows 2000 SP3 (5.0.2195.5329)and a eunuchs sendmail 8.9.1 box.
