diff --git a/docker-compose.yml b/docker-compose.yml
index c9e841c..0ea15b4 100644
--- a/docker-compose.yml
+++ b/docker-compose.yml
@@ -18,6 +18,8 @@ services:
       - ENABLE_SPAMASSASSIN=1
       - ENABLE_CLAMAV=1
       - ENABLE_FAIL2BAN=1
+      - POSTFIX_MAIN_CF=proxy_interfaces = 172.26.0.5
+      - POSTFIX_MASTER_CF_INET=127.0.0.1:25 inet n - n - - smtpd -o smtpd_upstream_proxy_protocol=haproxy
     volumes:
       - mail-data:/var/mail
       - mail-state:/var/mail-state