The only solution to save Outlook emails as an EML file is
eSoftTools Gmail Backup software. With this, you can save your emails from Gmail to EML files with just a few simple clicks. You can also save emails in PST, EMLX, MSG, HTML, MBOX, & PDF. The user interface of this software is also friendly so you can save emails very easily. You can also try the free demo of this software.
Read more:- save an email as an EML file in Outlook