Hello

I use a SMIME Certificate with firefox since a while with no problems, Exporting this certificate from Firefox and importing it to Kleopatra is no probelm too. The certificate shows as valid. But... when I like to assign this certificate to an eMail account I see the certificat but with a red cross striked thru. So I can not use it. Other certificats are shown and I could assign them.
So the question is what makes kmail think that there is a problem with this certificat though I can use it all over...?

THanks for any tip!
Michael