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I was once a customer of a certain developer who sold a SaaS bookkeeping software which allowed sending deal documents (invoice, receipt, etc) to a customer, from the software's very own email server, and any content sent was always digitally signed.

I know that in the context of emails, at least four "aspects" can be digitally signed:

  • The email server itself
  • The timestamp of sending
  • The sending source (email address I would presume)
  • The content of an email sent (including attached files)

My questions

  1. In the context of emails, what can be digitally signed (did I describe the aspects accurately and/or missed a certain aspect)?
  2. What should be digitally signed in the sub context of deal documents (I know that some bookkeeping software don't allow digitally signing anything and I want to know why some do and some don't)
George
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    #1 is answerable but #2 isn't - it just depends. A B2C e-commerce system won't bother signing anything because no one will bother checking it and won't care. Actually, that holds true for most B2B transactions to. In fact I can't think of why most would care about this, although I'm sure there are some cases when it would help – Conor Mancone Jul 25 '20 at 10:14

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