Hi damien,
what you are proposing to do is virtually impossible from a realistic 
stand point. In general email clients save all account settings 
including the user's email address in special account files in the local 
user's Application Data folder. If we were talking just one email 
program it might be a feasible concept. However, there are several email 
application choices out there including Outlook, Outlook Express, 
Windows Mail, Udora, Thunderbird, etc. It would be a nightmare to write 
a utility to support every known email clients unique account file and 
look inside for email settings and addresses.
Then there is of course all those users that use web mail services such 
as Yahoo, Google, Hotmail, etc which saves all the account settings on 
the host's server.In that case you are really in trouble as you need 
admin rights to the server just to get a peak into those files, and need 
to know what account to look into. In other words really and truly 
impossible.
About the only way you might be able to get their email address is have 
a demo registration screen that comes up when running the program 
forcing them to register the demo with a valid email address. this isn't 
ideal, because even that can be faked or cracked which was the very 
thing you tried to prevent in the first place.

Damien Sadler wrote:
> Well that would've been a slight problem. I thought it was possible to track 
> down an email address by their IP address, but many things could've 
> prevented that. I'll have to look for a method of retrieving the user's 
> email address from their computer or something like that.
> I'm sure their email address would be stored somewhere in the registry or in 
> their email client's server settings or whatever, unless there's any other 
> way of doing something like this...
> At least though, if I couldn't track down the user in question's email 
> address, I'd've had to release a patch that made all the previous keys 
> invalid and provide new keys to my existing customers who had obtained a 
> legal key.
> 
> Regards,
> Damien


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