diff --git a/stalwart-dev/config.toml b/stalwart-dev/config.toml
index 7dae4a8..4f27e00 100644
--- a/stalwart-dev/config.toml
+++ b/stalwart-dev/config.toml
@@ -61,3 +61,12 @@ email  = ["bob@localhost"]
 [authentication.fallback-admin]
 user   = "admin"
 secret = "admin"
+
+# Allow LOGIN/PLAIN on the clear-text dev ports (no TLS in local test env).
+# By default Stalwart only advertises PLAIN/LOGIN when is_tls — override that.
+[imap.auth]
+allow-plain-text = true
+
+[session.auth]
+mechanisms = "[plain, login, oauthbearer, xoauth2]"
+allow-plain-text = true
diff --git a/test/integration/imap_sync_test.dart b/test/integration/imap_sync_test.dart
index 04a7d71..d9b8041 100644
--- a/test/integration/imap_sync_test.dart
+++ b/test/integration/imap_sync_test.dart
@@ -63,7 +63,7 @@ void main() {
     final smtpClient = SmtpClient('test');
     await smtpClient.connectToServer(imapHost, smtpPort, isSecure: false);
     await smtpClient.ehlo();
-    await smtpClient.authenticate('$userA@localhost', passA);
+    await smtpClient.authenticate(userA, passA);
 
     final builder = MessageBuilder()
       ..from = [MailAddress('Alice', '$userA@localhost')]