Currently, FlexiPublish doesn't feature many extensions. In fact there is only one.
Postfix mailbox administration has been made easier with FlexiPublish. With the Postfix user management module, you can manage which domains you intend to receive or forward email for, what mailboxes exist on your server (with quotas, of course) and also aliases. Additionally, you get to decide who is the administrative contact for each domain for abuse purposes e.g.
If you would like to install this extension, please use the contact form to make the request the source files (free, of course!).