From 118f7b698f506a568c2528df3c0c4133b53f7d8c Mon Sep 17 00:00:00 2001
From: Nicolai Langfeldt <nicolai.langfeldt@schibsted.no>
Date: Fri, 25 Apr 2025 12:48:59 +0200
Subject: [PATCH] Do not auth unless we have something to auth with

---
 client.go | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/client.go b/client.go
index e10adf9..4c9ff8f 100644
--- a/client.go
+++ b/client.go
@@ -105,14 +105,14 @@ func handshake(client *smtp.Client, config *relayConfig, tlsConfig *tls.Config)
 	}
 
 
-	var auth smtp.Auth
+	var auth smtp.Auth = nil
 	if config.LoginAuthType {
 		auth = LoginAuth(config.Username, config.Password)
-	} else {
+	} else if config.Username != "" {
 		auth = smtp.PlainAuth("", config.Username, config.Password, config.Server)
 	}
 
-	if err := client.Auth(auth); err != nil {
+	if auth != nil && err := client.Auth(auth); err != nil {
 		return errors.Wrap(err, "auth error")
 	}
 	return nil