Contact list added to end of e-mail by mistake

Recently a mail was sent with Outlook 2007 using an Exchange server from my
company that had the senders entire contacts list added to the bottom of the
e-mail.

It was a forwared mail from another sender. When the mail was forwarded it
came through to the recipients with every e-mail address that the senders
address book/contact list contained added to the bottom of the e-mail.

Does anyone know what would have caused this? Or have any clue as to where
to look for the answer?

It only happened once and we have been unable to reproduce the problem.


Thank you,

Lorry84