PoliteMail works with the Translator for Outlook add-in to convert PoliteMail messages into different languages.  You can download Translator for free from the Microsoft store by clicking here.

Once the add-in has been installed, you will see a button in your Outlook ribbon.  

Click on the message in your inbox you want to translate, and then click the Translate Message button.  A drop-down menu will appear of available languages.  Choose the language and the message will be translated.