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while testing new security GPOs, i've found the problem that with E-Mails that contain HTML and Plaintext, Outlook always complains about invalid signatures or tempered messages, even though with the same E-Mails as pure HTML or pure Plaintext, Outlook has no problem with the signature. Can i fix this, or is this a Outlook bug?

This doesn't seem to be a problem with forced conversion, and i cant force use of HTML or Plaintext.

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    Define "invalid signatures". Commented Aug 30, 2021 at 11:50
  • With invalid signatures, i mean that Outlook complains that the signature is invalid or that the message has been tempered with. Commented Aug 30, 2021 at 11:59
  • Please clarify your specific problem or provide additional details to highlight exactly what you need. As it's currently written, it's hard to tell exactly what you're asking. Commented Sep 5, 2021 at 2:10

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What is your email server? Exchange server?

Does this issue occur to OWA If you use exchange accounts?

In addition, I want to confirm if this issue only occur to the outlook clients applied GPO?

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  • We have an exchange server, it happens to all clients. Commented Sep 1, 2021 at 5:03
  • Could you disable the GPO and check if this issue continues? Commented Sep 7, 2021 at 7:32
  • It does continue Commented Sep 7, 2021 at 9:33

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