Improve wording

docs/configuration.rst

@@ -74,12 +74,13 @@ meant to fight outbound spam in case of compromised or malicious account on the
 server.
 
 The ``RELAYNETS`` (default: unset) is a comma delimited list of network addresses
-for which mail is relayed for, with no authentication required. This should be
-used with great care.
+for which mail is relayed for with no authentication required. This should be
+used with great care as misconfigurations may turn your Mailu instance into an
+open-relay!
 
-The ``RELAYHOST`` is an optional address of a mail server to use as a smarthost for
-all outgoing mail in following format: ``[HOST]:PORT``.
-``RELAYUSER`` and ``RELAYPASSWORD`` can be used when authentication is required.
+The ``RELAYHOST`` is an optional address to use as a smarthost for all outgoing
+mail in following format: ``[HOST]:PORT``. ``RELAYUSER`` and ``RELAYPASSWORD``
+can be used when authentication is required.
 
 By default postfix uses "opportunistic TLS" for outbound mail. This can be changed
 by setting ``OUTBOUND_TLS_LEVEL`` to ``encrypt`` or ``secure``. This setting is