From 4d48c2417831b9b7ec4e1bc361ba360018e96e21 Mon Sep 17 00:00:00 2001
From: andreaci <andreaci@users.noreply.github.com>
Date: Wed, 12 Feb 2025 11:19:24 +0100
Subject: [PATCH] Update README.md to specify AuthenticationRequired

If AuthenticationRequired flag isn't explicitly changed, an authentication failure won't stop the client to send emails
---
 README.md | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/README.md b/README.md
index f9d8ca6..0712d82 100644
--- a/README.md
+++ b/README.md
@@ -44,7 +44,8 @@ var options = new SmtpServerOptionsBuilder()
     .Endpoint(builder =>
         builder
             .Port(9025, true)
-            .AllowUnsecureAuthentication(false)
+            .AllowUnsecureAuthentication(false) // this is to disallow sending PLAIN credentials without an SSL/TLS tunnel
+            .AuthenticationRequired(true)       // if this isn't explicitely set to true, the UserAuthenticator provider has no effect
             .Certificate(CreateCertificate()))
     .Build();