'optional_config' =>
{ 'stdout' => '/^(
- dkim_(canon|domain|private_key|selector|sign_headers|strict)
+ dkim_(canon|domain|private_key|selector|sign_headers|strict|hash|identity)
|gnutls_require_(kx|mac|protocols)
|hosts_(requ(est|ire)|try)_(dane|ocsp)
|hosts_(avoid|nopass|require|verify_avoid)_tls