Couldn’t for the life of me remember the subject line .. Knew about <confirm> but its the rest I forgot. So here you are: [More info here: http://www.blackberry.com/btsc/KB18737]
Send an email with the following subject:
<$Confirm,RemoveOnDelivery> BlackBerry Test Mail .. PLEASE DO NOT OPEN OR DELETE
Once it has been delivered to the device, you will get a return email like this:
Sent: 11 April 2013 16:59
Subject: BlackBerry Delivery Confirmation
SUBJECT: <$Confirm,RemoveOnDelivery> BlackBerry Test Mail .. PLEASE DO NOT OPEN OR DELETE
has been delivered to the recipient’s BlackBerry Handheld.