Well there are other ways to know if the email was opened.

Google shows for example
http://www.returnreceipt.com
http://www.msgtag.com/Mail_Receipt_.html

These use the feature called "web bugs"  http://en.wikipedia.org/wiki/Web_bug
to let some server know when the mail was opened.   Users with better  
security knowledge may prevent this from working.

I suspect some of them likely exploit the poor security on windows  
which might let them run programs by just open the email.


On Nov 20, 2007, at 7:49 AM, Gary Hurst wrote:

> suppose you send someone a lot of emails every day and they claim to  
> be
> never receiving 5% of them or so.  now you don't know if they are  
> really not
> getting them or just getting them and losing track of them.  how  
> does one
> set google mail up to get verfication of receipt of the emal?
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