vb.net - Using EWS to retrieve attachments from signed emails -

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i using exchange web services (ews) read emails , attachments. successful until started receiving emails digitally signed. found link ews: retrieving attachments signed emails solution starts off saying "... assuming security context has access key. " seems have problem. how can make sure security context has access key? how achieve that? code in above link gives me error: asn1 bad tag value met

are messages signed or encrypted (or both) ? decrypt encrypted message need have private key (eg smime these should have been exchanged) envelopedcms search current user (security context) , computer certificate store certificate information. in exchange in addition being stored locally certificate used decrypt message stored attachment on personal contact or in active directory http://blogs.technet.com/b/exchange/archive/2008/04/23/3405402.aspx.


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