Looks like <a href="http://www.pcreview.co.uk/forums/re-would-like-pop-up-warning-sending-external-emails-t2783605.html">this</a> is a similar request. Essentially, you'll need to code your own modifications, unless there is a third-party add on already that does this.
Last Wiki Answer Submitted: April 27, 2011 7:33 pm by Koohiisan4,990 pts.
If you live outside the United States, by submitting your email address you consent to having your personal data transferred to and processed in the United States.
By the time Exchange gets the message it is too late. What email client software do you use (that’s where you’d likely need the warning to occur)?
Hi,
We use outlook 2003 and 2007 clients.