Mysterious E-mail...

I'm not sure if this is exactly the right place to post this. But, I keep getting weird E-mails from "postmaster@mail.hotmail.com" about Ten E-mails from them all saying the same thing.

Q u o t e:
This is an automatically generated Delivery Status Notification. Delivery to the following recipients failed.
-someones emai here-

--Forwarded Message Attachment--
From: account@admin.blizzard.com
To: -someones email here-
Subject: Blizzard Notification About Character Faction Change
Date: Wed, 14 Jul 2010 17:04:51 +0800









Hello,



A Character Faction Change is now
pending for the World of Warcraft account [Removed]. Please allow
several days for the faction change process to complete. An email will be sent
to you when it is done. You can also track the status of your request by signing
into the Transaction page here: [Removed].


Below is a summary of the transaction, which you may want to keep for your
records.



------------------------------------------------------------------------------------------------------------------------------------------------



World of Warcraft Account Name: -someones email here-
TRANSACTION ID:
60468859



------------------------------------------------------------------------------------------------------------------------------------------------



Please note the following additional information:



- This account is not available for play while the faction
change is pending.
- If you did not make this transaction, you
should immediately check your account to prevent character
lost.
- This account cannot change factions again until 3
days have elapsed.
- You can review this and other Account
Management transactions by logging into Account Management and going to your
Transactions page at https://www.wow-europe.com/character/faction-change-status.html.
-
For more details on Character Faction Change, refer to the Character Faction
Change FAQ located at http://us.blizzard.com/support/article.xml?articleId=39810.



You can find World of Warcraft Account Management at: https://www.worldofwarcraft.com/account



We hope you enjoy your new faction!



Regards,



The World of Warcraft Team
Blizzard Entertainment

Keep note that where it says "someones email here" its different eveytime. I checked my sent messages its not like someone hacked my msn account. So...should i be worried about this or... what?