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P7M File - What is a .p7m file and how do I open it?

Learn about .P7M files and view a list of programs that open them.

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Overview

What is a P7M file? A P7M file is an S/MIME encrypted or signed email message. Most commonly, P7M files appear in web-based email clients, when they attempt to show an S/MIME encrypted message. Instead of showing the encrypted message, these programs show an empty message with a P7M attachment.

More Information Secure/Multipurpose Internet Mail Extensions (S/MIME) is an email encryption and digital signature standard. It is used to encrypt sensitive messages and verify senders' identities. For example, businesses might use S/MIME encryption to protect confidential medical or financial information sent via email. To use S/MIME, you must install an S/MIME certificate and link it with your email client, such as Microsoft Outlook or Apple Mail. If your email client is not linked to a valid S/MIME certificate, messages encrypted or signed using S/MIME will contain a P7M file. Most often, this file is named smime.p7m .

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155 votes

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DeveloperRSA Data Security
Popularity3.2 | 155 Votes

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.P7M File Extension

S/MIME Email Message

DeveloperRSA Data Security
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What is a P7M file?

A P7M file is an S/MIME encrypted or signed email message. Most commonly, P7M files appear in web-based email clients, when they attempt to show an S/MIME encrypted message. Instead of showing the encrypted message, these programs show an empty message with a P7M attachment.

More Information

Secure/Multipurpose Internet Mail Extensions (S/MIME) is an email encryption and digital signature standard. It is used to encrypt sensitive messages and verify senders' identities. For example, businesses might use S/MIME encryption to protect confidential medical or financial information sent via email.

To use S/MIME, you must install an S/MIME certificate and link it with your email client, such as Microsoft Outlook or Apple Mail. If your email client is not linked to a valid S/MIME certificate, messages encrypted or signed using S/MIME will contain a P7M file. Most often, this file is named smime.p7m .

Common P7M Filenames

smime.p7m - The default name for P7M files that arrive as email attachments. They usually contain encrypted email content.

How to open a P7M file

You can open P7M files in Cryptigo p7mViewer (Windows). If your P7M file contains an email that was only signed using S/MIME, you can open the file without a private key. If your P7M file contains an email encrypted using S/MIME, you need the private key used to encrypt the file.

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Programs that open P7M files

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Windows

Cryptigo p7mViewer

—

Discontinued

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Avvia GoSign Desktop

Free +

Mac

Avvia GoSign Desktop

Free +

Category: Misc Files

Updated: February 18, 2022

FAQ

What is a P7M file?↓
A P7M file is an S/MIME encrypted or signed email message. Most commonly, P7M files appear in web-based email clients, when they attempt to show an S/MIME encrypted message. Instead of showing the encrypted message, these programs show an empty message with a P7M attachment.
How do I open a .p7m file?↓
You can open P7M files in Cryptigo p7mViewer (Windows). If your P7M file contains an email that was only signed using S/MIME, you can open the file without a private key. If your P7M file contains an email encrypted using S/MIME, you need the private key used to encrypt the file.

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