diff --git a/tf-stage1/archlinux.tf b/tf-stage1/archlinux.tf
index c6c60414d10f39347aa0a39a87813c2ae6fd3941..a1d805a334db3a4bb3f04bb4f22184eb3505ce7a 100644
--- a/tf-stage1/archlinux.tf
+++ b/tf-stage1/archlinux.tf
@@ -84,7 +84,7 @@ locals {
       domain      = "mail"
     }
     "mailman3.archlinux.org" = {
-      server_type = "cx11"
+      server_type = "cx21"
       domain      = "mailman3"
     }
     "man.archlinux.org" = {