chore(settings): allow notls or none as smtptls setting for convenience

src/Settings.hs

@@ -417,6 +417,8 @@ instance FromJSON LdapConf where
           Just spec
             | spec == "insecure" -> return $ Just Ldap.insecureTlsSettings
             | spec == "default"  -> return $ Just Ldap.defaultTlsSettings
+            | spec == "none"     -> return Nothing
+            | spec == "notls"    -> return Nothing 
             | null spec          -> return Nothing
           Nothing                -> return Nothing
           _otherwise             -> fail "Could not parse LDAP TLSSettings"