EML is a text format for emails, with a file extension of .eml. This format was developed by Microsoft, so what if you want to use Gmail to open an .eml file or download an email as .eml? Here's how.
If you use Gmail, it's straightforward to download an email (either you have received or sent) as a .eml file. Here's how to do it using Gmail on desktop:
Opening a .eml file in Gmail is a little less intuitive. You can't drag and drop the file into the Gmail interface, and there's no option to File > Open or similar. Instead:
This is strictly a 'read only' operation - you can't edit the opened .eml file in Gmail or do anything else with it. But if you have an .eml file that you need to open and read, it's a good option.