Displays content of smime.p7m files and other files with file extension p7m: Reads signed and encrypted messages: Diagnoses undecrypted messages: Accepts Microsoft Outlook® messages: Fully functional 30 days trial license: Detailed online help system.
I have a friend who sends me emails to my gmail account that have attachments.p7m and when I click on the attachment it asks me what program I want to use to open the attachment. If I forward these emails to my work email which is outlook I can click on the attachments and they open fine. Apple Keychain Access; How to open P7M files. If you cannot open the P7M file on your computer - there may be several reasons. The first and most important reason (the most common) is the lack of a suitable software that supports P7M among those that are installed on your device. The P7M file which is being opened is infected with.
Back up your Mac
And your memories. A few simple steps can save you from losing your favorite photos and files.Learn how to back up your Mac
Mac service and repair
Learn about AppleCare+ and the Apple limited warranty coverage, start a service request for your Mac, and find out how to prepare your Mac for service.Learn more about repairs
Get AppleCare+ for Mac
With AppleCare+, you’re covered. Get accidental damage coverage and 24/7 priority access to Apple experts.
Have a question? Ask everyone.
The members of our Apple Support Community can help answer your question. Or, if someone’s already asked, you can search for the best answer
P7m Format FileAsk now
Tell us how we can help
Answer a few questions and we'll help you find a solution.Get support
Apple Service Programs
File TypeDigitally Encrypted Message
What is a P7M file?
A P7M file is an encrypted email message that contains the contents and attachments of a sensitive email. It is used to prevent unauthorized users from accessing information in an email and may require a private key that matches the message's public key in order to open the document. P7M files are typically used for protecting confidential medical, financial, and business information.
P7M files are typically seen as smime.p7m files. These files include the contents and attachments of an email and have been secured with Secure/Multipurpose Internet Mail Extensions (S/MIME), which is a public key encryption standard of MIME data.
Most P7M files, including smime.p7m files, can be opened using Cryptigo p7mViewer.Open over 300 file formats with File Viewer Plus.