From f5bcfa2e22db6cba141c890ae1948e5a39a87f0c Mon Sep 17 00:00:00 2001
From: worldworm <13227454+worldworm@users.noreply.github.com>
Date: Wed, 11 Jan 2023 01:57:11 +0100
Subject: [PATCH] docs: FAQ - Add note for `devnull` alias gotcha when using a
 catchall rule (#2949)

* updates docs faq devnull with sub-catch-all
---
 docs/content/faq.md | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/docs/content/faq.md b/docs/content/faq.md
index 09ef6c4c..dc8e1cad 100644
--- a/docs/content/faq.md
+++ b/docs/content/faq.md
@@ -257,6 +257,15 @@ Considering you want to delete all the e-mails received for `baduser@example.com
 baduser@example.com devnull
 ```
 
+!!! important
+    If you use a catch-all rule for the main/sub domain, you need another entry in `docker-data/dms/config/postfix-virtual.cf`:
+
+    ```cf
+    @mail.example.com hello@example.com
+    baduser@example.com devnull
+    devnull@mail.example.com devnull
+    ```
+
 ### How do I have more control about what SPAMASSASIN is filtering?
 
 By default, SPAM and INFECTED emails are put to a quarantine which is not very straight forward to access. Several config settings are affecting this behavior: