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You can sign with both PGP and S/MIME. Contrary to Oliver Schmidt's response, it is possible to create an external signature using PGP (you can sign any file with a PGP key, not just text - a executable (.exe) is not a good candidate for inline signatures). This is referred to as "PGP/MIME". An external signature on a PGP file will be *.sig and S/MIME will ...


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To make a long story short: Yes, that will work and it will make sense, too. I'll try to explain this: PGP stores the signature inside the email body. The body of a PGP-signed mail usually begins with -----BEGIN PGP SIGNED MESSAGE-----, followed by the hash algorithm and the message clear text, followed by -----BEGIN PGP SIGNATURE-----, followed by ...


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In practice: No, you need to make sure many other elements of the network aren't fooling you. I will concentrate on the transmission here. First, you want to make sure, you can contact the right recipient’s server. To do that, your sending mail servers does a DNS-Lookup for the MX-Record of the domain. Then the resulting FQDN has to be resolved to get an ...



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