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 ...