diff --git a/install/debian/11/exim/exim4.conf.template-RC b/install/debian/11/exim/exim4.conf.template-RC
index 9c5fc6717..605d848ab 100644
--- a/install/debian/11/exim/exim4.conf.template-RC
+++ b/install/debian/11/exim/exim4.conf.template-RC
@@ -345,6 +345,7 @@ remote_smtp:
   dkim_private_key = DKIM_PRIVATE_KEY
   dkim_canon = relaxed
   dkim_strict = 0
+  hosts_try_fastopen = !*.l.google.com
   hosts_try_chunking = !93.188.3.0/24
 
 procmail: