I run Win XP SP3 with Comcast as my ISP. I use Thunderbird as my email client and lately I receive a daily delivery status notice copied below. I do not know anyone with the email address that I am supposely sending messages to. The full message is below. I have run malwarebytes, spybots and microsofts malware detector. Anyone have a suggestion as to what may be causing this annoying issue?

Frank
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Removed all text which contained personal information.

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