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RPMSG EML
Not possible

Convert RPMSG to EML

Can you convert RPMSG to EML?
Verified by Adam B.· reviewed by FE Editorial ·updated Jul 15, 2026
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Is it possible to convert RPMSG to EML?
No - not a direct conversion.

There is no way to convert .rpmsg to .eml. If you are the intended recipient, open the original email in Microsoft Outlook while signed in with the recipient address - Outlook fetches the decryption license automatically.

No direct path
Also to EML: P7Z · OST · MSG

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Tested on macOS, Windows & Linux
Last verified Oct 2026

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Why convert RPMSG to EML?

A .rpmsg file is a zlib-compressed, DRM-protected container; decryption keys are issued per-recipient by Microsoft's cloud rights-management service after verifying the signed-in account matches the recipient list. .EML is a plain-text RFC 2822 format requiring readable content that cannot be obtained from an encrypted blob without authorized access.

How to convert RPMSG to EML

Microsoft Outlook APP

Open the original email in Microsoft Outlook signed in as the recipient address; Outlook contacts the rights-management service, fetches the license, and displays the message without you needing to open the .rpmsg attachment manually.

Programs that convert RPMSG

Microsoft Outlook

About these formats

.RPMSG Restricted Permission Message

An RPMSG file (almost always named message.rpmsg) is an encrypted, rights-protected email container created by Microsoft Outlook when the sender applies Information Rights Management (IRM).…

Open .RPMSG details →
.EML E-Mail Message (RFC 822 / MIME)

An EML file is one email message saved as a plain-text file - headers, body, and any attachments - in the internet-standard MIME/RFC 822 format. You do not need Microsoft Outlook to open…

Open .EML details →

Quality & what to watch

  • Tools advertised as RPMSG-to-EML converters either repackage the undecryptable blob unchanged or require you to supply the recipient's credentials.
  • If you received the protected email in Gmail or another non-Microsoft client, look for a 'Read the message' link in the email body that opens the Purview encrypted-message portal.
  • If you cannot access the message through either route, ask the sender to resend without rights protection or using Microsoft Purview Message Encryption with a portal link.

Frequently asked questions

Can any third-party software decrypt and convert an RPMSG file?
No - decryption requires your credentials and a live connection to Microsoft's rights-management service; no desktop tool can obtain the per-recipient key without authenticating through Microsoft.
I found a website claiming to convert RPMSG to EML - should I use it?
No - the conversion is technically impossible without the recipient's credentials; such sites either deliver the file unchanged or attempt to collect your login details.
Why did I receive a file called message.rpmsg?
The sender applied rights protection; email clients that do not support Microsoft IRM cannot display the content inline and receive it as a .rpmsg attachment instead.