diff --git a/install/debian/10/exim/exim4.conf.template b/install/debian/10/exim/exim4.conf.template
index c1f285ea..95e9bc48 100644
--- a/install/debian/10/exim/exim4.conf.template
+++ b/install/debian/10/exim/exim4.conf.template
@@ -310,6 +310,7 @@ remote_smtp:
   dkim_private_key = DKIM_PRIVATE_KEY
   dkim_canon = relaxed
   dkim_strict = 0
+  hosts_try_chunking = !93.188.3.0/24
 
 procmail:
   driver = pipe