what is the general consensus here of this technique for privacy (not anonymity) when there can be a delay in your message being read?

"Uninterceptable electronic messages"
http://thesleeperagent.blogspot.com/...-for-2009.html

http://jimthompson.org/wp/2006/04/29...ual-dead-drop/
Webmail account if you had full SSL session encryption not just SSL-secured login and you can attach files too.

It still would circumvent the SMTP and email header traffic monitoring.
Actually is there anyway this can be monitored?

I'm sure the big webmail providers yahoo, hotmail, gmail have some sort of monitoring of this? Anyone?