Why does Yahoo lie about Hackers abuse Yahoo-Accounts?

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Quite nice what I learned this morning – an inactive Yahoo-account of mine was sending spam! After I reactivated the account by using my phone-number and checked… First I deleted all contacts and changed the password. Then I checked the header of the spam-messages:

Received: from [xxx.xx.xx.xx] by tm11.bullet.mail.ird.yahoo.com with NNFMP; 12 Mar 2013 09:51:43 -0000
Received: from [] by omp1022.mail.ir2.yahoo.com with NNFMP; 12 Mar 2013 09:51:43 -0000
X-Yahoo-Newman-Property: ymail-3

NNFMP is an e-mail transfer protocol used internally at Yahoo. However, Yahoo has publically stated that it does not exist!
Yahoo uses this protocol to internally route email traffic across their network. The acronym stands for “Newman No-Frills Mail Protocol”. It`s a simple, high-performance protocol comparable to QMTP. Read more here: http://en.wikipedia.org/wiki/Yahoo!_Mail

The IP is a ‘Localhost’ which means it is “this computer”. Since the header states: [] by omp1022.mail.ir2.yahoo.com it cannot me MY computer.

Yahoo states that these spams come from hacked computers. Yes, that is right. In this case it is Yahoo that was hacked.

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