What is this "X-Apparently-To :" in my email

I am puzzled how a e-mail attention to "LastChange@yahoo.com" ended up in my inbox which is "Brandy@yahoo.com" I checkup on the Message Source and found the details as below. What is this "X-Apparently-To :.."

X-Apparently-To: Brandy@yahoo.com via web11607.mail.yahoo.com; 18 Jun 2001 09:20:08 -0700 (PDT)
X-Track: 12599-1: 2
Received: from  (EHLO josmex.joskes.com.mx) (
  by mta582.mail.yahoo.com with SMTP; 18 Jun 2001 09:20:06 -0700 (PDT)
From: postmaster@mail3.9netway.com
Message-Id: <200106181517.LAA13774@josmex.joskes.com.mx>
Date: Mon, 18 Jun 2001 12:14:19 -0400
To: LastChance-MasterCD2001@yahoo.com
Subject: MasterCD 2001 Disc -  EBiz Marketing Leads

Last chance for MasterCD2001 at $99.95!
Who is Participating?
When some email/maillist engines receive an email, they will break the message up so that each person receives a copy.  In this case, X-Apparently-To is added to the header so the software knows which mailbox to deliver the message to.

So the question is... do you belong to any yahoo groups (which used to be egroups) and did you set your options so that group moderators can't add you to their mailing lists?
hhhengAuthor Commented:
Thanks for your comment.

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