Receiving blank email messages

[rdijkstra]

Does someone know how to solve this problem. Since I use Plesk software on my Windows server I receive blank email messages in my email.

Config:
- Windows 2003
- Plesk 7.5.6
- MailEnabled 1.8
- SpamAssassing 2.64

I think these messages come from the SpamAssassin software.

Message details:
Received: from ([127.0.0.1]) with MailEnable ESMTP; Wed, 21 Jun 2006 19:31:46 +0200
Message-ID: <000801c69558$8f0e5660$65878d55@homedbncr7l8cr>
X-Spam-Checker-Version: SpamAssassin 2.64 (2004-01-11)
X-Spam-Level: **
X-Spam-Status: No, hits=2.9 required=7.0 tests=DATE_MISSING,FROM_NO_LOWER
autolearn=no version=2.64

Are there any tips to solve this problem???

Thanks

Ronald