Automatic Email Manager can print PRN file attached to an email, but you have to know that PRN files are a little special because the printer must be shared on the computer, even if it is a local or network computer, the printer name must be the same than the sharing name (for example printer name is 'Samsung printer 1', the shared must be the same). The printer model and settings must be the same than the PRN file has been generated.

To summarize, you can use PRN only on a computer which has generated the file, or the computer has the same printer with the same name.