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My organization uses S/MIME certificates to digitally sign and encrypt emails. We would like to add a disclaimer at the bottom of our emails, which can be done via the mail flow settings in Office 365.
However, if the message is edited by the server after it has been signed by the sender, the certificate will show as invalid.
Is there a way to add an organizational email footer without affecting S/MIME functionality? Or is the only solution to add the disclaimer to to the client's signature?
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Email disclaimers are a waste of time and electrons. Disclaimers in Email Signatures are Not Just Annoying, But Legally Meaningless: "Lawyers and experts on internet policy say no court case has ever turned on the presence or absence of such an automatic e-mail footer in America, the most litigious of rich countries."
– DavidPostill – 2016-05-23T21:33:35.983