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format file p7m

What is a p7m file and how do I open a p7m file?

A P7M file is an encrypted email message in which the contents and attachments are enveloped in an smime.p7m file. A private key matching the public key in the message is needed to open the document file.

Mac OS
Recommended p7m file download:
Cryptigo p7mViewer
QUALCOMM Eudora with Cryptigo S/MIME plug-in
Apple Keychain Access
Detail p7m file extension information:
File Type: p7m
File Format: Digitally Encrypted Message
Primary Association: Multiple Use Files
Mime Type: application/keychain_access, application/pkcs7-mime, application/x-pkcs7-mime