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ListMessenger exceeds expectations as a well designed, easy to use, lightweight mailing list management solution for your website. ListMessenger is feature packed but because of its intuitive design remains simple to use and easy to maintain.
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How does ListMessenger handle bounced e-mails?

ListMessenger currently does not have an automated bounce handling system, although future versions of the program will contain this feature.

ListMessenger does have an administrator definable "Errors To:" e-mail address that can be set in the ListMessenger Program Preferences. Any bounced messages will be automagically returned to this address for either manual processing or for /dev/null'ing.