Step-by-step instructions on how to forward all emails as attachments
When a message is forwarded to Outlook, the forwarded email appears in the body of the new message. If you don’t want a forwarded email to be included in the message, forward it as an attachment. Normally, you select this option every time you forward a message, but you can set Outlook to automatically attach forwarded emails as an EML file every time you forward a message.
The instructions in this article apply to Outlook 2019, 2016, 2013, 2010; and Outlook for Office 365.
Forward emails as default attachments in Outlook
To set Outlook to automatically forward email as .eml file attachments:
Go to the tab File and select parameters: †
Select a category mail †
In section Reply and forward select drop-down arrow When forwarding a message and select Attach original message †
Select Okay †