service/email.md

@@ -240,8 +240,10 @@ Then rehash that map as well:
 
     postmap /etc/postfix/sender_relay
 
-Make sure you do *not* change the `relayhost` (above), or reset it to
-its previous value. If you have changed your [`default_transport`](http://www.postfix.org/postconf.5.html#default_transport),
+If you are setting `smtp_sender_dependent_authentication`, 
+*do not* set the `relayhost` (above).
+
+If you have changed your [`default_transport`](http://www.postfix.org/postconf.5.html#default_transport),
 you'll also need a [`sender_dependent_default_transport_maps`](http://www.postfix.org/postconf.5.html#sender_dependent_default_transport_maps) as
 well: