base.m4: Get the `authenticated_sender' rune right.

diff --git a/base.m4 b/base.m4
index 9d08088..f1701d1 100644 (file)
--- a/base.m4
+++ b/base.m4
@@ -253,7 +253,7 @@ smtp_local:
        tls_dh_min_bits = 3070
        tls_tempfail_tryclear = false
        authenticated_sender = ${if def:authenticated_id \
-                                   ${authenticated_id@CONF_master_domain} \
+                                   {$authenticated_id@CONF_master_domain} \
                                    fail}
 
 ## A standard transport for local delivery.