P7M File - opening and understanding

Did your computer fail to open a P7M file? We explain what they are used for and recommend software that we know can open or otherwise handle your .P7M files.

What is a P7M file?

Files that contain the .p7m file extension hold encrypted email messages. The P7M file format is a container format and the contents and the attachments of the encrypted email message are enveloped into the encrypted P7M file.

Oftentimes a user must have a private key installed into their email client in order to open the P7M files that they receive. The private key will match the message's public key so that the user can open the P7M file. This private key is static and does not change so that a user does not have to enter new information to open each P7M file they receive.

The P7M file format implements the Secure/Multipurpose Internet Mail Extension standard (S/MIME).

How to open P7M files

You will need a program compatible with the specific file you are trying to open, as different programs may use files with file extension P7M for different purposes.

While we have not verified the apps ourselves yet, our users have suggested 10 different P7M openers which you will find listed below.

Suggest another file format using extension P7M

While we know of one file format using the .P7M file extension, there may be more. It is widespread that different programs use files with the same file extension for very different types of data. Please let us know if you are aware of a different kind of .P7M file.

Various viewers for this file format

These apps are known to open certain types of P7M files. Remember, different programs may use P7M files for different purposes, so you may need to try out a few of them to be able to open your specific file.

p7mViewerp7mViewerUser submitted
InfoNotary e-Doc SignerInfoNotary e-Doc SignerUser submitted
SecSignerSecSignerUser submitted
DigiSignerDigiSignerUser submitted
DSToolDSToolUser submitted
digiSeal readerdigiSeal readerUser submitted
dikedikeUser submitted
B-Trust Combo LiteB-Trust Combo LiteUser submitted
EasySignEasySignUser submitted
RIB AVA-SignRIB AVA-SignUser submitted
We have not verified any software that we know for certain will work with P7M-files on Mac. If you know one, please use the 'Suggest a program' link below and tell us about it!
We have not verified any web services that we know for certain will work with P7M-files. If you know one, please use the 'Suggest a program' link below and tell us about it!