Can I check if e-mail address is valid?
<p>How can I implement following logic?</p>

<ul>
<li><p>User registers with an e-mail address</p></li>
<li><p>If provided e-mail address is a valid
email address Then user account get's
activated</p></li>
<li><p>or if it is a fake email    then user
account is not activated</p></li>
</ul>

<p>I doubt that I can catch the - "Delivery failed reply message", right?
anyhow how would you suggest to implement the above logic? </p>

<p>PS. I will have to find a way no matter what, client wants it =)</p>
