diff --git a/SMTP-Configuration.md b/SMTP-Configuration.md
index fb9035c..f16d76c 100644
--- a/SMTP-Configuration.md
+++ b/SMTP-Configuration.md
@@ -1,3 +1,6 @@
+> [!NOTE]
+> If you don't set up SMTP, Vaultwarden might be unable to send verification emails when you log in outside web vault, browser extension and mobile apps (e.g. Bitwarden CLI), and might secretly reject the authentication request. To bypass this behaviour, set up two-factor authentication on your account. See https://github.com/dani-garcia/vaultwarden/discussions/6410
+
 You can configure vaultwarden to send emails via a SMTP agent:
 
 ```sh