[SC-Help] How did this find my mailbox

[Fred k]

My email address or a To: field is nowhere in the header.

Return-path: <POKADIGBO at terra.es>
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Date: Thu, 10 Feb 2005 15:28:13 +0100
From: POKADIGBO <POKADIGBO at terra.es>
Subject: Letter
Reply-to: p.okadigbo at catpost.co.uk
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Fred k