"openssl smime" always seems to want a "cert.pem" after all the options and I haven't got that.
However, a lot of trial and error testing of the executable has been frustrating because I can't find the right combination of flags to just say "open the smime.p7m file and write out all the embedded files you find". It looks like OpenSSL will decode/extract this and someone managed to get a version compiled on Windows. I tested this by using a laptop that had no certificates and simply opened the smime.p7m file with the aforementioned viewer. This enables you to use more than one email addresses or to import historic certificates. You can import several keys from diffrent certificate files. The private keys are imported into the app. However, what I really need is a command-line based extracter that will write out the embedded files (PDFs, DOCs, XLSs) - they're not encrypted, just signed. S/MIME Reader allows you to decrypt and read S/MIME encrypted emails (.p7m). Using a GUI-based viewer, I can see the embedded files and extract them with no problem. The process now only extracts one file (smime.p7m). New regulations have all messages with attachments now being digitally signed. We have an old process (VBScript) that reads a common mailbox and processes certain emails into a database.
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