VSTO plug-in: Digital ID name cannot be found by the underlying security system.

Devendra Tewari 1 Reputation point
2021-01-27T07:46:00.287+00:00

I have developed an outlook plug-in. I have deployed this with outlook 2016 and for particular user, we are getting following exception while accessing different fields like subject, attachment or sender information :--

our Digital ID name cannot be found by the underlying security system.
at Microsoft.Office.Interop.Outlook._MailItem.get_SenderEmailType()

Your Digital ID name cannot be found by the underlying security system.
at Microsoft.Office.Interop.Outlook._MailItem.get_Attachments()

Can somebody suggest why these exception comes and what is solution ? Initially I thought it is because user had old s/mime encrypted mails. But we are getting this exception in draft also for newly created draft mails as well.

Thanks
Dev

Office Development
Office Development
Office: A suite of Microsoft productivity software that supports common business tasks, including word processing, email, presentations, and data management and analysis.Development: The process of researching, productizing, and refining new or existing technologies.
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  1. Devendra Tewari 1 Reputation point
    2021-01-28T12:42:14.903+00:00

    Actually I found reason partially. It is happening because s/mime certificate was not configured on that user machine. I can understand the impact of it in s/mime mails.

    But I still dont understand, for draft, even we have not switched on s/mime, why it is throwing exception.
    Does it mean that if s/mime is configured, irrespective of all options are disabled from trust centre and encrypt and sign has not selected, still, s/mim perform encryption on draft mail in outlook ?

    Anu thoughts ?

    Thanks
    Dev

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