How is someone doing this? (Spoofing an email)

Long story short: I must have entered my email somewhere unsecure, and I'm getting fake world of warcraft admin emails, trying to scam me. Not worried about it because I don't even have an account set up in under this email.

My question is this: How are they sending me emails from an email ending in blizzard.com? Are they doing a telnet?

from WoWAccountAdmin@blizzard.com <WoWAccountAdmin@blizzard.com> reply-to WoWAccountAdmin@blizzard.com to ****@gmail.com date Wed, Jan 6, 2010 at 2:35 PM subject World of Warcraft Account Management mailed-by hotmail.com <—— ????

<?php $to = 'victim@lol.com'; $subject = 'subject…'; $message = 'hello…'; $headers = 'From: spoof@example.com' . "\r\n" . 'Reply-To: spoof@example.com' . "\r\n" . 'X-Mailer: PHP/' . phpversion(); mail($to, $subject, $message, $headers); ?>

you should report it to blizzard some sites have report fake emails pages.

Dim objMailMessage As New System.Net.Mail.MailMessage

With objMailMessage .IsBodyHtml = False .From = New MailAddress("Admin@theInter.net") .To.Add("victim_1@sucker.net") .To.Add("victim_2@hotmail.com") 'why blame just one person? .Subject = "On the Spot Fine!!!" .Body = "You've just broken the Internet! Please send $1000 so we can fix it! :-)" End With

Dim objSMTPClient As New System.Net.Mail.SmtpClient("some-relay.somewhere.net", 25) '<<port number objSMTPClient.DeliveryMethod = SmtpDeliveryMethod.Network objSMTPClient.Send(objMailMessage)