Score:0

Outlook: Invalid signature of mixed HTML/Plaintext E-Mails

in flag

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.

joeqwerty avatar
cv flag
Define "invalid signatures".
Björn Max Jakobsen avatar
in flag
With invalid signatures, i mean that Outlook complains that the signature is invalid or that the message has been tempered with.
Score:0
us flag

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?

Björn Max Jakobsen avatar
in flag
We have an exchange server, it happens to all clients.
Joy Zhang avatar
us flag
Could you disable the GPO and check if this issue continues?
Björn Max Jakobsen avatar
in flag
It does continue
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