Open P7M file format – Free Viewer – Programs and How to

File extension p7m is an encrypted type message of files.


What is the .P7M format

The P7M File is an encrypted message.

Mime: application/pkcs7-mime
Mime: application/x-pkcs7-mime

PKCS #7 MIME Message (RFC 2311 MIME)

S/MIME (Secure/Multipurpose Internet Mail Extensions) provides a consistent way to send and receive secure MIME data through files. Based on the popular Internet MIME standard, S/MIME provides the following cryptographic security services for electronic messaging applications: authentication, message integrity and non-repudiation of origin (using digital signatures) and privacy and data security (using encryption).

How to open p7m files

You can use the following free viewers online, software and programs to open the files.

For Windows:

  • p7m viewer
  • Cryptigo S/MIME Plugin,
  • Cryptigo p7m Viewer for Eudora

For MAC:

  • Apple Keychain access

This file is usually part of a file attachment in a mail message. You will need the private jey that matches the created public key of the original message.

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