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Outlook hanging opening mails with S/MIME signature
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Open mails with S/MIME digital signature causes Outlook 365 local application to hang.
Windows 10 Enterprise 1803, 17134.590


3.1.5 / Outlook 365 / Windows 10

Event Timeline

Hi, thanks for the report.

the problem is likely a slow CRL server (like cacert) which blocks the signature verification. You can use Kleopatra -> Settings -> Configure Kleopatra -> S/MIME validation -> "Never consult a CRL" to disable it.

We have it on our todo to improve this. E.g. we should already show the contents of the mail if a signature verification takes long. The issue for this is T4118