code: public boolean verifyRFC822SpecialCase(X500Name subject) throws IOException {
          for (AVA ava : subject.allAvas()) {
              ObjectIdentifier attrOID = ava.getObjectIdentifier();
              if (attrOID.equals((Object)PKCS9Attribute.EMAIL_ADDRESS_OID)) {
                  String attrValue = ava.getValueString();
                  if (attrValue != null) {
                      RFC822Name emailName;
                      try {
                          emailName = new RFC822Name(attrValue);
                      } catch (IOException ioe) {
                          continue;
                      }
                      if (!verify(emailName)) {
                          return(false);
                      }
                  }
               }
          }
          return true;
      }
docs: Perform the RFC 822 special case check. We have a certificate
  that does not contain any subject alternative names. Check that
  any EMAILADDRESS attributes in its subject name conform to these
  NameConstraints.
  
  @param subject the certificate's subject name
  @returns true if certificate verifies successfully
  @throws IOException on error