How can I find all encrypted and/or signed emails in outlook?

How can I find those emails and is it possible to make a search folder containing those emails?

I tried several fields and tried to make a search folder, but found no attribute for this search.


The criteria for a custom search folder would be (Search Folder Criteria | "Advanced" tab | "Field" button | All Mail Fields):

  • Message Class contains IPM.Note.SMIME (for both signed/encrypted messages);
  • Message Class is (exactly) IPM.Note.SMIME (for encrypted messages only);
  • Message Class is (exactly) IPM.Note.SMIME.MultipartSigned (for signed messages only that are not encrypted).