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Error when trying to open a digitally signed email

Exchange 2003, Outlook 2003
User tries to open an email that is digitally signed and gets this error.
"Can't open this item.  Your digital ID name can not be found by the underlying security system."
I found another post that suggested unchecking an item under the security tab of outlook but that didn't do it.
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mcrossland
Asked:
mcrossland
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1 Solution
 
PC_RobCommented:
Check this article out.  this solved another post with the same problem:

http://support.microsoft.com/kb/831601

Regards,

Rob
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mcrosslandAuthor Commented:
That is for Exchange 2000 server.  I'm on Exchange 2003, outlook 2003
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PC_RobCommented:
Sorry, sometimes the answers still apply to newer versions.  I see no other articles or posts with an answer on my searches.
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mcrosslandAuthor Commented:
I found the issue.  There was a file extension attached to that email that was required to view the digital signature.   Once I allowed that through the Watchguard firewall, it worked.
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Vee_ModCommented:
Closed, 500 points refunded.
Vee_Mod
Community Support Moderator
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