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How can I tell if an smime.p7m file contains an encrypted or signed message?

April 26, 2017encrypted file message signed

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How can I tell if an smime.p7m file contains an encrypted or signed message?

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You cannot tell it before opening the file. When the file is opened, p7mViewer will tell you if the message is encrypted and/or signed and will also let you check information on who can decrypt the message and who signed it.