diff --git a/docs/content/config/advanced/mail-forwarding/relay-hosts.md b/docs/content/config/advanced/mail-forwarding/relay-hosts.md
index ca54ff4d..4caa82dd 100644
--- a/docs/content/config/advanced/mail-forwarding/relay-hosts.md
+++ b/docs/content/config/advanced/mail-forwarding/relay-hosts.md
@@ -18,8 +18,6 @@ An SMTP relay service (_aka relay host / [smarthost][wikipedia::smarthost]_) is
 
 All mail sent outbound from DMS (_where the sender address is a DMS account or a virtual alias_) will be relayed through the configured relay host.
 
-For technical details on both supported ENV and config files, see the [Relay Host section][docs::env-relay] of our ENV docs.
-
 !!! info "Configuration via ENV"
 
     Configure the default relayhost with either of these ENV:
@@ -108,6 +106,44 @@ We provide this support via two config files:
     - Relay mail through `[smtp.sendgrid.net]:2525` when mail is sent from a sender of `@domain1.com`
     - Mail with a sender from `@domain3.com` is not sent through a relay (_**Only applicable** when using `RELAY_HOST`_)
 
+### Technical Details
+
+- Both the supported ENV and config files for this feature have additional details covered in our ENV docs [Relay Host section][docs::env-relay].
+- For troubleshooting, a [minimal `compose.yaml` config with several DMS instances][dms-gh::relay-example] demonstrates this feature for local testing.
+- [Subscribe to this tracking issue][dms-gh::pr-3607] for future improvements intended for this feature.
+
+!!! abstract "Postfix Settings"
+
+    Internally this feature is implemented in DMS by [`relay.sh`][dms-repo::helpers-relay].
+
+    The `relay.sh` script manages configuring these Postfix settings:
+
+    ```cf-extra
+    # Send all outbound mail through this relay service:
+    relayhost = [smtp.relay-service.com]:587
+
+    # Credentials to use:
+    smtp_sasl_password_maps = texthash:/etc/postfix/sasl_passwd
+    # Alternative table type examples which do not require a separate file:
+    #smtp_sasl_password_maps = static:john.doe@relay-service.com:secret
+    #smtp_sasl_password_maps = inline:{ [smtp.relay-service.com]:587=john.doe@relay-service.com:secret }
+
+    ## Authentication support:
+    # Required to provide credentials to the relay service:
+    smtp_sasl_auth_enable = yes
+    # Enforces requiring credentials when sending mail outbound:
+    smtp_sasl_security_options = noanonymous
+    # Enforces a secure connection (TLS required) to the relay service:
+    smtp_tls_security_level = encrypt
+
+    ## Support for advanced requirements:
+    # Relay service(s) to use instead of direct delivery for specific sender domains:
+    sender_dependent_relayhost_maps = texthash:/etc/postfix/relayhost_map
+    # Support credentials to a relay service(s) that vary by relay host used or sender domain:
+    smtp_sender_dependent_authentication = yes
+    ```
+
+
 [smarthost::mailgun]: https://www.mailgun.com/
 [smarthost::mailjet]: https://www.mailjet.com
 [smarthost::sendgrid]: https://sendgrid.com/
@@ -115,3 +151,6 @@ We provide this support via two config files:
 [wikipedia::smarthost]: https://en.wikipedia.org/wiki/Smart_host
 
 [docs::env-relay]: ../../environment.md#relay-host
+[dms-repo::helpers-relay]: https://github.com/docker-mailserver/docker-mailserver/blob/v14.0.0/target/scripts/helpers/relay.sh
+[dms-gh::pr-3607]: https://github.com/docker-mailserver/docker-mailserver/issues/3607
+[dms-gh::relay-example]: https://github.com/docker-mailserver/docker-mailserver/issues/3842#issuecomment-1913380639