ssl_verify_client_cert=yes does not require a client certificate

Hello, I am trying to set up LMTP over TLS. I have set ssl_verify_client_cert: protocol lmtp { ssl_ca = ctx->client_ctx) verify_flags = SSL_VERIFY_NONE; else - verify_flags = SSL_VERIFY_PEER | SSL_VERIFY_CLIENT_ONCE; + verify_flags = SSL_VERIFY_PEER | SSL_VERIFY_CLIENT_ONCE | SSL_VERIFY_FAIL_IF_NO_PEER_CERT; SSL_set_verify(ssl_io->ssl, verify_flags, openssl_iostream_verify_client_cert); }