All about RFC822 Files

The RFC822 file type is primarily associated with Microsoft Exchange Server.

RFC822	File extension: RFC822
	File type:	Text email message file

What is an RFC822 file?

RFC822 files mostly belong to Microsoft Exchange Server.

This RFC822 file is a plain text file that stores an email message. It follows the RFC822 standard, which sets the rules for email headers and the message body.
When you open such a file, you will see important details including:

Headers – Lines that list sender, recipient, subject, and date.
Body – The main text content of the email.
Routing information – Data used by mail systems to process and deliver messages.

FilExt.com tips: This format is used by systems such as Microsoft Exchange Server and by email clients like Mutt. You can open these files with any text editor if you want to inspect the email structure manually. For a more user-friendly view, use an email client that supports RFC822 messages. For further information, visit Microsoft Exchange documentation.

How can I open an RFC822 file?

You need a suitable software like Microsoft Exchange Server to open an RFC822 file. Without proper software you will receive a Windows message "How do you want to open this file?" or "Windows cannot open this file" or a similar Mac/iPhone/Android alert. If you cannot open your RFC822 file correctly, try to right-click or long-press the file. Then click "Open with" and choose an application. You can also display a RFC822 file directly in the browser:. Just drag the file onto this browser window and drop it.

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Programs that open and convert RFC822 files:

Microsoft Exchange Server
See the previous paragraphs to learn more about the main application. RFC822 files are often referred to as Microsoft Exchange Server simple text files because this type of file is primarily created or used by this software.
Email clients (e.g., Thunderbird, Outlook, Apple Mail) and email servers
RFC822 files, often simply called "email files," are plain text files formatted according to the RFC822 standard (later superseded by RFC2822 and subsequently RFC5322). These files store email messages in a structured format that includes headers (like To, From, Subject, and Date) and a body, which can contain plain text or other content encoded according to standards like MIME. The structure allows email clients and servers to parse and process messages reliably. While primarily associated with email, the RFC822 format can also be used for other text-based communication. This file format is classified as Email Message File.

Technical Data for RFC822 File Extension

File classification:

Simple text file

Related files:

eml, msg, mbox, emlx, mail, nws, msf, ldif

an rfc822 Text email message file is a special file format and should only be edited and saved with the appropriate software.

How to solve problems with RFC822 files

Associate the RFC822 file extension with the correct application.
Update your software that should actually open text email message files. Because only the current version supports the latest RFC822 file format. Search, therefore, e.g. on the manufacturer website after an available Microsoft Exchange Server update.
To make sure that your RFC822 file is not corrupted or virus-infected, get the file again and scan it with Google's virustotal.com.
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