This encrypted and signed message 200, with the session keys 205 and digital signature and signature-related information 305, is sent to the message server 40 running on a computer system.
The only things that distinguish this case from undesirable forms of signed message replay is the intent of the replayer, which cannot be determined by the network.
Many mailing lists, especially those that do not modify the content of the message and signed header fields and hence do not invalidate the signature,engage in a form of signed message replay.
A larger number of domains are potential victims of signed message replay than chosen message replay because the former does not require the ability for the attacker to send messages from the victim domain.
So unlike handwritten signatures, that tend to be the same regardless of the message,each digitally signed message will have a different digital signature.
If you do not have the S/MIME control installed,and receive an encrypted or digitally signed message, you will be prompted to install the control when you open the message..
While a DKIM signed message speaks for itself, there is ambiguity if a message doesn't have a valid first party signature(i.e., on behalf of the[RFC2822]. From address): is this to be expected or not?
For this reason, accreditation and reputation services, as well as locally-maintained whitelists and blacklists,will need to play a significant role in evaluating messages that have been signed by third parties.
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