[Portions of this MIME document are encrypted with a Notes certificate and cannot be read

Hi all

I sent encryption mail from Notes client to Microsoft Outlook receipt user, The mail as delivered to MS Outlook but when opening the encryption mail in MS Outlook the receipt user could not able to see content mail,

The message in MS outlook mail appear “[Portions of this MIME document are encrypted with a Notes certificate and cannot be read.]”

Please Please can you help me anybody in this problem

Thanks in advance