Hi I leave here this miniexplicación if anyone encounters the same problem, mounted on a windows vps, has plesk 9.5 Magic installed Spam, which supposedly, has support for this structure, it can work with mail enable.
People MagicSpam forgot to indicate that your version does not work on versions of Windows 64 bits on 4.2x versions of MailEnable, Plesk 9.5.x and by default comes with Mail Enable 4.26.
What is the solution, as we download the latest version of MailEnable http://www.mailenable.com/download.asp#standard y sobre escribir la versión anterior, IE, FOR ANY REASON THE PREVIOUS VERSION UNINSTALL, have to be installed above, and during installation indicate that we want to save the data in the MailEnable bd.
Once installed we can install the magicspam, and now it will work smoothly.