new file mode 100644
--- /dev/null
+++ b/smtp.conf
@@ -0,0 +1,54 @@
+# Config for smtp.t tests.
+
+worker_processes  1;
+
+master_process off;
+daemon         off;
+
+events {
+    worker_connections  1024;
+}
+
+mail {
+    proxy_pass_error_message  on;
+    auth_http  http://localhost:8080/mail/auth;
+    xclient    off;
+
+    server {
+        listen     10025;
+        protocol   smtp;
+        smtp_auth  login plain none;
+    }
+
+    server {
+        listen     10026;
+        protocol   smtp;
+        smtp_greeting_delay  100ms;
+    }
+}
+
+http {
+    access_log    off;
+
+    server {
+        listen       8080;
+        server_name  localhost;
+
+        location = /mail/auth {
+            set $reply ERROR;
+
+            if ($http_auth_smtp_to ~ example.com) {
+                set $reply OK;
+            }
+            if ($http_auth_pass ~ secret) {
+                set $reply OK;
+            }
+
+            add_header Auth-Status $reply;
+            add_header Auth-Server 127.0.0.1;
+            add_header Auth-Port 25;
+            add_header Auth-Wait 1;
+            return 204;
+        }
+    }
+}