On Fri, 12 Feb 2010 13:45:33 -0500, Tony wrote:

http://www.atrendyhome.com/mailchimealert.html

That sounds promising.
It seems to work on the door opening and not on mail being placed in the
mailbox.

I wonder how that chime works in an all-metal mailbox.
(How does it figure out that the door has been opened?)

The ad doesn't say HOW it figures out that the mailbox has been opened.

My mailbox looks similar to this one:
http://romangladiator.biz/images/016_ak9r.jpg