>How can i send an email from Visual FoxPro 7 using any mail client resident on the user's PC.

That's a tall order :-)

One method is to avoid the mail client and send email directly from VFP to the mail server via SMTP. You can do this with wwipstuff from www.west-wind.com or www.mabry.com (never used the Mabry one). Here is an example on how to use wwipstuff

http://www.west-wind.com/presentations/internetenabling/InternetEnabling.htm

If the mail client is MAPI compliant then you could use Nigel's class
http://www.levelextreme.com/wconnect/wc.dll?FournierTransformation~2,54,Forum=5,28,1034