CAV Removing Mail Certs

When sending an email that is dgittally signed the cert does not make to the recipient
When recieving and email that is digitally signed the cert is not there

Yes i know the mails are signed becasue they are sent from my computers that I have certs loaded on.

If I turn CAV off then the emails make it digitally signed

Is there away to have CAV not remove email certs.