>Hi Sergey,
> I got the html document you suggested, thanks. I went to the web site you suggested--how would I use it to determine whether or not an email address is valid? Thanks.

In VFP you can use WSH as shown below.

* FUNCTION ValidateEmailAddress
LPARAMETERS tcEmailAddr
LOCAL loRegExp
loRegExp = CreateObject("VBScript.RegExp")
loRegExp.IgnoreCase = .T.
loRegExp.Pattern = '< Email Validation pattern you prefer here >'
RETURN loRegExp.Test(tcEmailAddr)