S/MIME is a standard for public key encryption and signing of MIME data. S/MIME is on an IETF standards track and defined in a number of documents, most importantly RFCs.

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Which hash algorithm is used when using S/MIME by default? [duplicate]

I just installed my S/MIME certificates on my iPhone 6 for both, signing and encryption. Using a mail client on computers I can configure which hash algorithm and encryption is used. As for example ...
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How can I see if an e-mail is signed in “Mail” (using an Exchange account)?

Usually, a signed message shows a checkmark icon. Clicking on this icon displays the certificate that was used to sign the message: Not so when a message lies in an exchange mailbox, and is ...
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How do I import a SMIME certificate and automatically set the Keychain trust?

We are deploying SMIME certificates to all clients and we need to ensure that these certificates are only trusted for email. Given that our users are "unmanaged" and off the corporate network, how ...