Viewing Emails from within a SharePoint Document Library
To view emails from within a SharePoint Document library:
Upload MSG or EML files to the document library.
Open the context menu for the file. You’ll see the option View Email.
The context menu for an email message as seen in a SharePoint message
Click the View Email option. Email contents will be displayed in a new window.
The Aspose.Email viewer showing an email from within a SharePoint library