>They have new members sign up, and they must provide an e-mail address.
>
>They/we are having a lot of problems with invalid e-mail address, and
>they do not want to implement a confirmation e-mail, instead using a
>component to do a real time check if the e-mail address is valid.
>
>The problem is yahoo.com is doing something different and the component
>will not fail on an invalid yahoo.com e-mail address. It seems that the
>component (http://www.hexillion.com/software/components/HexValidEmail/)
>does not do the actual SMTP send command, but I am not well versed in
>these things.
The problem is that Yahoo accepts all E-mail to @yahoo.com, and then
generates its own bounce messages later if the user doesn't exist. That's
probably a tactic to help prevent people from harvesting addresses.
Note that a lot of domains do this, such as most setups with gateways that
pass mail on to another local mailserver. When this happens, a validator
will not be able to tell whether or not the address exists without actually
sending mail to it. Unfortunately, there is no way around that.
-Scott
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