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How to stop people from using my domain to send spam?

I have google apps handling the email for my domain (musikpitch.com). Some Cialis spam got sent with the email address stacee953-camp@musikpitch.com, but I don't' have that user set up. What might be happening?

Begin forwarded message:

From: <> Date: November 4, 2011 7:01:48 AM CDT To: Subject: =?utf-8?B?QXV0b05vdGlmeTogQ2lhYWxpcyBpcyBhIHNvbHV0aW9uIGZvciBtZW4gd 2l0aCAxbXBvMA==?=

The Following Message was blocked by Surf Control. Message [oa806c7383d49438885c572e1d1c8bcce.pro] triggered rule [Illegal MIME format] at 7:01:48 AM 11/4/2011

Sender: stacee953-camp@musikpitch.com Recipient(s): <> Subject: Ciaalis is a solution for men with 1mpo0

Because the message is probably SPAM. If you believe this message was blocked in error, please send a message to POSTMASTER@JBHUNT.COM. Messages returned to <> will be DISCARDED.

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marked as duplicate by Michael Hampton, voretaq7 Nov 6 '12 at 4:22

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1 Answer 1

Nothing special. Someone forged the sender of the Spam mail and the recipient bounces this message back to you. But you probably never send the mail. Without the headers of the forwarded mail it is impossible to investigate further.

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Thanks. If thats the case, are there any steps to take? –  Josh Crews Nov 4 '11 at 15:45
    
@JoshCrews No. If (and only if) this is a bounce for a forged(!) mail there is nothing you can do. This is called Backscatter and can be ignored. Only Google (as your provider) could act. –  mailq Nov 4 '11 at 15:53
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@JoshCrews Look into setting up SPF records. en.wikipedia.org/wiki/Sender_Policy_Framework –  84104 Nov 4 '11 at 15:55
    
^^ But does google entertain SPF?? I guess not ! –  Gaumire Nov 4 '11 at 16:13
    
Google Apps works very well with SPF - when you signed up they provided you with basic documentation and the recommendation to set up SPF. GMail now uses SPF on all mail, and they're now using (and pushing) Domain Keys in addition to SPF. –  Dom Nov 5 '11 at 3:18
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