bit-count as "NORMAL" (2432) and Thunderbird dropping connection. */
int tls_dh_max_bits = 2236;
uschar *tls_dhparam = NULL;
-uschar *tls_eccurve = US"prime256v1";
+uschar *tls_eccurve = US"auto";
# ifndef DISABLE_OCSP
uschar *tls_ocsp_file = NULL;
# endif