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There is more about this change in the post Email Address Validation Updated.
Stop bad email addresses before they get into your system. Let's face it, validating, verifying and checking input data is not what is generally described as a "fun" activity if you're a web developer.
The idea provides an extra nudge for the user to double check the email address, a nudge to supplement other email address validation methods.
If an incorrect address is provided for a newsletter subscription, the subscriber never will receive the confirmation request nor any of the newsletters.
The site user never gets the help and the site owner is likely to be perceived as being unresponsive.
Some forms require the user to provide the email address twice.