+dkim_canon string* unset smtp 4.70
+dkim_domain string list* unset smtp 4.72
+dkim_private_key string* unset smtp 4.70
+dkim_selector string* unset smtp 4.70
+dkim_sign_headers string* (RFC4871) smtp 4.70
+dkim_strict string* unset smtp 4.70
+dkim_verify_signers string* $dkim_signers main 4.70