1 files changed, 1 insertions, 0 deletions

diff --git a/hosts/surtr/email/default.nix b/hosts/surtr/email/default.nix
index aebe03db..accb41f4 100644
--- a/hosts/surtr/email/default.nix
+++ b/hosts/surtr/email/default.nix
@@ -124,6 +124,7 @@ with lib;
             "-o" "smtpd_tls_ask_ccert=yes"
             "-o" "smtpd_tls_req_ccert=yes"
             "-o" "smtpd_client_restrictions=permit_tls_all_clientcerts,reject"
+            "-o" "smtpd_relay_restrictions=permit_tls_all_clientcerts,reject"
             "-o" "smtpd_recipient_restrictions=reject_unauth_pipelining,reject_non_fqdn_recipient,reject_unknown_recipient_domain,permit_tls_all_clientcerts,reject"
           ];
         };