Fake email addresses are a big problem for busy web sites.
Most form validation code merely looks for a "@" and a "."
in the email address. This is extremely inadequate.
Databases get populated with bad email addresses, resulting
in several important problems such as :

* When you are sending a mass email to your site's
membership, a large percentage of these emails get returned
wasting valuable bandwidth. Many people do not realize, but
bandwidth is wasted doubly, since bad emails are sent, and
then returned.
* Many companies hire temporary workers to painstakingly
remove these bad addresses. This is costly, both in terms of
time and money. Additionally, this is a reactive solution.
* Users who sign up with fake addresses get to view your
content or use your software without providing proper
contact information.

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