.P7Z File Extension
S/MIME Compressed Email Message
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What is a P7Z file?
A P7Z file is an email message compressed in the S/MIME (Secure/Multipurpose Internet Mail Extensions) standard. It contains one or more parts of a message compressed with zlib compression.
Most email applications, such as Microsoft Outlook, Apple Mail, and Mozilla Thunderbird, support compressed S/MIME messages. However, if an email program does not handle compressed data, a P7Z file may appear as an attachment (smime.p7z) to the email message.
Programs that open P7Z files
Included with OS