What is EML File Format?

Technical Specification of EML File

Developer Microsoft
File Type Electronic Mail
File Extension .eml
Format Text & Binary
MIME Type Message/RFC 822

EML file is an electronic mail file, which contains email message and attachments. It is an individual email message file. A file with .eml extension is archived email messages file that preservers the original formatting and headers. This file contains plain ASCII text for the headers, main message body, hyperlinks, and attachments. The header portion includes the email id of the sender, the email address of the receiver, the subject line text, and the time. EML file format for email file referred as RFC-822 file format. EML file extension is supported by various email clients such as Windows Live Mail, Outlook Express, Thunderbird, Entourage, etc.

Main Purpose of EML File Format

The main purpose of EML format is to save email messages in the standard file structure. EML files can be view by using any text editor like notepad and it can be accessed through multiple email clients.

How to access EML files

If users have .eml file extension supported application installed on their machine then you need to just double-clicking on it.

If you cannot access received EML in Outlook Express then follow the below-mentioned steps to access EML file:

  1. Open My Computer
  2. Click on Tools option and then click on Folder Options
  3. Now, click on File Types tab and then select EML Outlook Express email
  4. fter that, click on Advanced tab
  5. In the new window, select Open and then click on Edit button
  6. In the Application used to perform action box, type the command C:\Program Files\Outlook Express\MSIMN.EXE" /eml:%1
  7. After that, click on OK button in next two windows

Is there any need to access EML emails data with their attachments into Outlook email application then you have to convert emails from EML to PST format.

Way to Create EML File On Desktop?

This file is generated by various email clients. Most email clients automatically create an .eml file extension when users open an email message. To create EML file on the desktop simply drag and drop the email messages present in the EML file supported email application such as Outlook Express, Entourage, Thunderbird, etc.

Difference Between EML And EMLX Files

EML files are generated from Windows-based email application such as Outlook, Thunderbird, Entourage, etc. whereas the EMLX files are created from Mac-based email client such as Apple Mail. Apart from this aspect, there is as such no other major differences between both these file formats.


EML files are the text file that is used to store a single message with attachments. The main purpose of creating an EML file is to store the files offline and to allow forwarding of email messages and their content. In this section, we have described .eml file extension in detail, so the user can get the detail information about this file extension.

Many email applications don't support EML files directly. In this case, you need a verified software to convert EML files in different format.