Apple Mail

Apple Mail is the default email software included in all version of MacOS since 10.0. With the release of MacOSX Tiger (10.4), the EMLX format was introduced.

File Information
EMLX files are stored in the Users home Library/Mail folder and an Eml file with the addition of a byte count at the beginning and a Plist at the end. The Plist contains flags indicating read status, replied, and other attributes. EMLX files can be converted to stand-alone Eml files.