Maybe, maybe not.  What if Mail.app is programmed <i>only</i> to turn on this back door in certain circumstances?  Only a very small percentage of people would ever think to packet sniff all the data their computer is sending.  If this privacy-invading mode could be turned on by, say, sending a very specific spam-looking message to Mail.app, you could use this capability only when needed and be almost guaranteed that the target user is not running a packet sniffer.<p>Also, how are you going to packet sniff what your iPhone is sending over 3G?