I recieved this weird email today?-Collection of common programming errors

Sender: “Mail Delivery Subsystem” Subject: Returned mail: see transcript for details Message: The original message was received at Sun, 10 Feb 2008 21:43:40 -0800 (PST) from speedster.cc.kana.corp.yahoo.com [207.126.228.28] —– The following addresses had permanent fatal errors —– (reason: 553 5.3.0 … User unknown) —– Transcript of session follows —– … while talking to ccmrin2.corp.dcn.yahoo.com.: >>> DATA

Originally posted 2013-11-09 20:53:06.