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What is smime.p7m?
An smime.p7m file is a secure email: the content and attachments have been secured according to S/MIME to protect it from unauthorized access. To view the secure content, open it with p7mViewer - the secure mail viewer.

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Most often, you find an smime.p7m file in web-based mail readers, when they try to display a secure email. For example:
Other mail readers that are not SMIME compatible will also display smime.p7m in such situation. In such situation you can download p7mViewer to open the smime.p7m file and read the message.
What is inside an smime.p7m file?
The raw content of an smime.p7m file looks similiar to this:
Content-Type: application/x-pkcs7-mime;smime-type=enveloped-data;name="smime.p7m"
Content-Transfer-Encoding: base64
Content-Disposition: attachment;filename="smime.p7m"

p7mViewer will display this file as:
smime.p7m examples
Any data, not only e-mail can be secured using S/MIME. For example, the help file for p7mTool, the tool for creating secure electronic mail and documents, could be :
Encrypted to Alice Viewer, without any MIME headers or encoding:
Signed by Bob Viewer, encoded in Base 64, with MIME headers:
Signed by both Bob and Alice Viewer, encrypted to Dave and Alice, with MIME headers but no inner headers:
Attached to a text file with a short description and encrypted, signed and again encrypted (by and to Alice)
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