we are using exchange 2003. one of our user received the below mail today certainly. we never received such alert from our exchange server. I checked accountupdate.com but didn't impressed. if any one can verify this for me.
From: Email Admin [mailto:firstname.lastname@example.org]
Sent: Monday, December 31, 2012 8:35 PM
Subject: Your email account was accessed from another computer
Your email account was recently logged into from another computer,
mobile device or other location on this IP 18.104.22.168.
For your protection, Please take a second to update your records by
following the reference below