X509_check_email
valid_mail = X509_check_email(x, checkemail, 0, 0);
&& X509_check_email(x, vpm->email, vpm->emaillen, 0) <= 0) {
int X509_check_email(X509 *x, const char *chk, size_t chklen,
ret = X509_check_email(crt, name, namelen, 0);