Our company is changing email addresses. The majority of users were converted to a new email address and a few other groups have not been converted yet. We do use encryption certificates for approval emails. This is the error we are getting when receiving an approved email from a DBA whom appears to have not been converted yet. How do we resolve this ?? How do we get the certificates to work in both directions ?? old to new and new to old. When we had her send the approval email to an old email address we still got the same error so it appears the certificates on our converted emails removed the certificates.