Sign mail in iNotes with X.509 certificate stored in a smart card

I need to sign email in iNotes with certificate stored on a smart card. When I hit “Send” button web mail offer me to sign only with notes ID and does not read X.509 certiface on the smart card. Instead of iNotes, web browser (IE)can see sertificates stored on the smart card. What needs to be done to enable signing with X.509 certificates stored on a smart card in iNotes ?Domino server is version 8.5

Subject: import x.509 in your notes.id

you can do it via notes menu - security - user security - your indentity -your certificates - get certificates - import internet certificates