diff --git a/roles/mail_forwarder/templates/main.cf.j2 b/roles/mail_forwarder/templates/main.cf.j2
index e075ae437fe6fefe0831c05cdf1ac32f74a0fe3c..f13509eb940a4ecf1f0f4f187c92909c812a174f 100644
--- a/roles/mail_forwarder/templates/main.cf.j2
+++ b/roles/mail_forwarder/templates/main.cf.j2
@@ -41,3 +41,7 @@ mynetworks = 127.0.0.0/8 [::ffff:127.0.0.0]/104 [::1]/128
 mailbox_command = procmail -a "$EXTENSION"
 mailbox_size_limit = 0
 recipient_delimiter = +
+
+# Fall-back to using native lookups (/etc/hosts etc) if DNS lookup fails. Useful
+# for local overrides of mail servers.
+smtp_host_lookup = dns, native