Not sure if this is a problem for you still or not, but if it is, you might need to clear out some things to make the notification go away.
On the main screen that shows the individual threads – hit the menu soft key and hit More – then to delivery report – this might display every message you’ve sent if you have these settings on.
If you don’t want them on – thumb through the Settings and on to Retrieve Settings – this will allow you to toggle the various delivery reports.
Not sure if this helps, but you can also link you phone up to your computer via USB and move all of the downloaded images in the Handcent file to another location.
