A mail without mail address 2

Dear Friends

I have received one blank mail in my yahoo mail address without sender information.
In this mail, from and message sender have left blank, can we send a mail without mail address.
I am surprised how this is possible, how any body can send a mail without his/her mail id. If any body know about this type of mail services please help me.
If really this thing is possible then which site is providing this service.
The mail message, which I have received, is as quoted hereunder;
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Date: Fri, 18 Jan 2008 16:39:00 +0000
To: veerugcet@yahoo.com
From:
Subject:

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Unquote

I am in more doubt, can be this kind of mail contains virus or what the meaning of such kind of mail to send me.