The WordPress Email Notification Plugin v3.0 is still being developed, but in the meantime there is an issue with v2.3.1 which could allow spammers to use the plugin to send mass e-mails from your server. To address this issue we have created an alpha version of v2.3.2 which we need users to test before we release the beta version and then the final version of 2.3.2.
If you are interested in testing the alpha and beta versions, please contact us and we will e-mail you the new files.