diff --git a/docs/rolereference.rst b/docs/rolereference.rst
index 3feb770c857178951e2ecdc5bde4a7b74c301f0e..53f26db315944fdae628b5eb4fe898cde4ab3c93 100644
--- a/docs/rolereference.rst
+++ b/docs/rolereference.rst
@@ -1230,6 +1230,13 @@ Parameters
   recipients/aliases, while the value provided should be a space-separated list
   of mail addresses (or local users) where the mails should be forwarded.
 
+**smtp_from_relay_allowed** (boolean, optional, ``True``)
+  Specify if SMTP traffic from SMTP relay should be allowed or not (for bounced
+  messages, for example). This parameter should be set to ``False`` on systems
+  behind NAT or on systems that may not have constant network connectivity (such
+  as laptops) to avoid firewall failures since SMTP relay name needs to be
+  resolvable.
+
 **smtp_relay_host** (string, optional, ``None``)
   SMTP server via which the mails are sent out for non-local recipients.
 
@@ -1264,6 +1271,8 @@ Here is an example configuration for setting-up the mail forwarder:
 
   smtp_relay_host: mail.example.com
 
+  smtp_from_relay_allowed: False
+
   smtp_relay_truststore: /etc/ssl/certs/example_ca_chain.pem