Automatic Email Manager leans on the internal system to print pdf files, yet there might be times you'd rather use an external app (or default program) for a different visual output. That's why you can force 'Automatic Email Manager' to use the default Windows app to peek at and print PDFs.
Step 1: Go the settings of Automatic Email Manager
- Click on 'Settings' on the left menu of Automatic Email Manager, then section 'Email attachment', then click on 'File types management'.
Step 2: Search for the extension PDF and click on 'Settings'
Step 3: Change the option to use internal program to default program
NOTE: You have to know that using external program will not work when you are not logged to Windows (in service mode).