When your Praetor evaluation period expires it will no longer perform filtering. SMTP messages can still be received and sent without the benefit of Praetor monitoring the content of those messages and filtering.
At no time are any messages lost!
Leaving Praetor in a disabled state means that you can simply re-activate it after your purchase and receive the fully licensed serial number and its matching authentication code. All your rules will therefore remain intact and you won't need to re-install the software.
Click here to learn how to disable Praetor.