CACHelp

'Problems validating this signature' on signed emails in OWA

windows

Symptoms

Signed messages open but show a signature validation error.

Likely cause

*.mail.mil is not in IE Trusted Sites.

Fix

1. IE > Tools > Internet Options > Security > Trusted sites > Sites. 2. Add https://*.mail.mil > Close > OK. For other branches, follow win10smime.pdf.

Sourced from militarycac.com. Rewritten for clarity.

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