How can I receive mail not addressed to me?

This is a security question. Have any of you been receiving mail not addressed to you?
Lately, after the installation of MacOSX 10.4.10 on her G4 PowerBook, a family member has been receiving letters in Apple Mail not addressed to her. Had they arrived by mail, they should have been moved to her Junk Folder by her junk filter.
At first this alarmed me greatly (well, it still does): I removed her computer from the internet & performed examinations for break-ins; for I believed these letters were not mailed, but inserted into her inbox. Because she doesn't believe in security, I was limited to examining logs, and scanning her computer in firewire target disk mode. Both MacScan and ClamXav revealed nothing.
Puzzle 1: About a month ago, there appeared a finder image (happy blue face) at the bottom of her desktop (which is a unique grey-green designed by me). This disappeared in a day or two, at 5:00p on the dot, suggesting an application was involved. When I checked the logs at the exact date & time of desktop photo switches, there was an hiatus (which could have been natural).
Puzzle 2: Today she again received a letter not addressed to her, but to '[email protected]'. (I sent a letter from a mail alias to this address, but it did not appear in her mailbox.) The letter, by the way, was a phish from Germany, so I reported it immediately to Spam Cop. An addendum to this question contains the header of this letter, with the real person's name replaced by [email protected]. (Nothing here need be removed by a moderator.)
Has anyone an explanation for either of these puzzles? I think they're both important. (Before the internet was released upon the public, Postmasters would read the recipient and subject lines of dead letters, then forward them to whoever they thought it was for. 'Krystal2' has no relation to 'correctname', so that's unlikely.) Also, my wife has allowed me to secure her computer better, and no problems similar to 1 or 2 has ever appeared. Thanks very much for any ideas!
Bruce
ADDENDUM: Long Header of Letter (safe to display)
Return-path: <[email protected]>
Received: from mac.com ([10.150.68.24])
by ms173.mac.com (Sun Java System Messaging Server 6.2-7.05 (built Sep 5
2006)) with ESMTP id <[email protected]> for
[email protected]; Wed, 21 Nov 2007 10:14:18 -0800 (PST)
Received: from dslb-088-068-127-106.pools.arcor-ip.net
(dslb-088-068-127-106.pools.arcor-ip.net [88.68.127.106])
by mac.com (Xserve/smtpin024/MantshX 4.0) with SMTP id lALIDf9G011038; Wed,
21 Nov 2007 10:13:48 -0800 (PST)
Received: from pacbell.net (seclude.pacbell.net [12.57.124.138])
by wptop.com with SMTP id 0QPZBZ0LZ5 for <[email protected]>; Wed,
21 Nov 2007 12:12:45 -0600
Date: Wed, 21 Nov 2007 10:13:41 -0800 (PST)
From: BB&T <[email protected]>
Subject: BB&T: security alert! (message id: JT4786381)
To: Krystal2 <[email protected]>
Message-id: <[email protected]>
MIME-version: 1.0
X-Mailer: Calypso Version 3.20.01.01 (4)
Content-type: multipart/alternative; boundary=--LSNV40EM4DGH64PSJJH7BC
X-Priority: 3 (Normal)
X-Originating-Server: maido3.com (unknown [40.36.3.192])
User-Agent: Calypso Version 3.20.01.01 (4)
Original-recipient: rfc822;[email protected]
----LSNV40EM4DGH64PSJJH7BC
Content-Type: text/html;
Content-Transfer-Encoding: 7Bit

David,
Sorry, migraine over the holidays. Thank you: you're right! The reason I don't get any like this is because the SPAM must apparently use RFC822. This protocol appears deprecated. It appears stamped on some mail initially sent by Apple, but not others.
Thank you very much, for these have been concerning me. I'm used to seeing my name stamped by each relaying computer. A test letter I sent from my local ISP with a BCC to myself at a school across the country stamped my name at each step.
Your first sentence is slightly ambiguous. In my opinion, any problem whose only explanation at the moment is a security breach is then a security problem, and should be treated immediately as such. The Finder's image is still one.
Thanks again.
Bruce

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