File type: Digitally Encrypted Message
The P7M file extension is used in files created using the Cryptigo email encryption software. The signed or the encrypted email file has the smime.p7m file name may only be unencrypted with the P7M Viewer.
Moreover, the files with this format may only be present in the system when common attachments like .doc files or .xls files are attached aside from the .p7m file attachment.
These files may also exist when an email message is converted to MAPI from the original MIME file or when the email message is edited and saved.
A user may also encounter a .p7m file if the parent or the envelope message is signed or encrypted.
Category: Archive and Compressed Files
File format: Open-Source
Open with Windows: Cryptigo S/MIME Plugin, Cryptigo p7mViewer for Eudora
Open with Linux: N/A
It is also significant to note that this file extension is only used in encrypted files sent as file attachment.
To open the file attachment, the encrypted or signed message may also require a private key that matches the public key of the message.