Nothing in the To: line, the link is to an IP address and the download is an .EXE file which probably means Trojan Virus.

From: Postcard [mailto:received@postcard.org]
Sent: Sunday, August 31, 2008 12:00 AM
Subject: You have just received a virtual postcard from a friend !

To:

You have just received a virtual postcard from a friend !

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You can pick up your postcard at the following web address:

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http://72.54.207.20/postcard.exe

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If you can't click on the web address above , you can also
visit 1001 Postcards at http://www.postcards.org/postcards/
and enter your pickup code, which is: d21-sea-sunset

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(Your postcard will be available for 60 days.)

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Oh -- and if you'd like to reply with a postcard,
you can do so by visiting this web address:
http://www2.postcards.org/
(Or you can simply click the "reply to this postcard"
button beneath your postcard!)

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We hope you enjoy your postcard, and if you do,
please take a moment to send a few yourself!

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Regards,
1001 Postcards
http://www.postcards.org/postcards/