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A method some email providers use to block spammers.
If someone attempts to send an email from an email address that is not in the users address book, a challenge email
is sent back to the sender. The challenge email will require the sender to verify that they are a human, and not a computer program. Typically this is done
using a CAPTCHA code.
Example CAPTCHA Code
The user is asked to enter the captcha code (8B7E in this case) into a text box to validate that they are a human, and not an automated sender.
Bounce Processing Challenge Responses
XMS Email Application Server's bounce management filter separates challenge response emails and allows you to forward them to another email address (such as your secretary) so that they can be processed by a human, and your newsletter will be delivered to users with challenge response accounts.
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