The extension .EML refers to files of the type Email messages. The EML email files can vary in their structure based on the client program that created these files.

The Eml files follow generally the same structure and allow the users to store message information in the email format. This also allows the user to use various email formatting features and add attachments to the email messages. Generally, these files are exported to the Email processing client software like Microsoft outlook et al. The EML email files are also supported by Microsoft's Internet explorer browser and thus a read-only version of the email can be opened in the browser itself.