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So I just logged into an old email address to see a ton of similar messages like the one below:

To: "oliver@example.com" <oliver@example.com>
Content-Transfer-Encoding: 7bit
Mime-Version: 1.0 (1.0)
X-EPC-Online-SMTP5-smtp2-MailScanner-Information: Please contact the ISP for more information
X-MailScanner-ID: r3OF2bbC078149
X-EPC-Online-SMTP5-smtp2-MailScanner: Found to be clean
X-MailScanner-From: 8ea9588@mydomain.com

Yo oliver,

Can we meet? :-)
http://www.example.ru/?9616B5C=7439D3A82039DA1C4E2

I'm waiting for you :-) xoxo

Sent from my iPhone

Oh, no.

Has my email server been compromised?

I have root access to my dedicated server. I logged in and found no trace of anybody logging in before myself last december.

Does anybody have any idea how this email has apparently been sent from an email account that doesn't exist on my domain and is apparently getting me flagged as spam?

share|improve this question
    
Are you sure it comes from you, and isn't just backscatter? –  NickW Apr 24 '13 at 15:55
    
How could I possibly determine that? I did receive a notice about it being possible backscatter, so that's a good thing I take it? –  darkAsPitch Apr 24 '13 at 16:12
    
Well, normally mail that is sent from your server should have the servers it passed through in the headers, it's much more likely that someone is impersonating you, and the mail is getting sent back to your address as though it came from you –  NickW Apr 24 '13 at 16:17

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