diff --git a/roles/postfix/vars/main.yml b/roles/postfix/vars/main.yml
index 7288ffc74..e402a7815 100644
--- a/roles/postfix/vars/main.yml
+++ b/roles/postfix/vars/main.yml
@@ -34,6 +34,8 @@ postfix_relay_hosts_addresses:
   - fpul-prod1.princeton.edu
   - lae-prod1.princeton.edu
   - lae-prod2.princeton.edu
+  - libserv14.princeton.edu
+  - libserv144.princeton.edu
   - lib-aeon.princeton.edu
   - lib-approvals-prod1.princeton.edu
   - lib-approvals-prod2.princeton.edu