This plugin will find MX injections. This kind of web application errors are mostly seen in webmail software. The tests are simple, for every injectable parameter a string with special meaning in the mail server is sent, and if in the response I find a mail server error, a vulnerability was found.
This plugin doesn’t have any user configured options.
For more information about this plugin and the associated tests, there’s always the source code to understand exactly what’s under the hood:
Plugin source code
Unittest source code
This plugin has no dependencies.