unset routers 4.00
unset transports
drop_cr boolean false main 4.00 became a no-op in 4.21
+dscp string unset smtp 4.81
dsn_from string* + main 4.67
envelope_to_add boolean false transports
envelope_to_remove boolean true main
gecos_pattern string unset main
gethostbyname boolean false smtp
gnutls_compat_mode boolean unset main 4.70
+gnutls_enable_pkcs11 boolean false main 4.81
gnutls_require_kx string* unset main 4.67 deprecated, warns
string* unset smtp 4.67 deprecated, warns
gnutls_require_mac string* unset main 4.67 deprecated, warns