diff --git a/rootfs/etc/confd/templates/main.cf.tmpl b/rootfs/etc/confd/templates/main.cf.tmpl
index a355d2e..58c648f 100644
--- a/rootfs/etc/confd/templates/main.cf.tmpl
+++ b/rootfs/etc/confd/templates/main.cf.tmpl
@@ -20,8 +20,8 @@ virtual_mailbox_maps = proxy:ldap:/etc/postfix/ldap-virtual-mailbox-maps.cf
 virtual_alias_maps = proxy:ldap:/etc/postfix/ldap-virtual-alias-maps.cf
 virtual_transport = lmtp:inet:{{getenv "LMTP_HOST"}}:{{getenv "LMTP_PORT"}}
 
-smtpd_tls_key_file=/etc/ssl/mail/{{getenv "KEYNAME" "privkey.pem"}}
-smtpd_tls_cert_file=/etc/ssl/mail/{{getenv "CERTNAME" "fullchain.pem"}}
+smtpd_tls_key_file=/etc/ssl/mail/{{getenv "KEY_NAME" "privkey.pem"}}
+smtpd_tls_cert_file=/etc/ssl/mail/{{getenv "CERT_NAME" "fullchain.pem"}}
 
 smtpd_tls_security_level = {{getenv "TLS_SECURITY_LEVEL" "may"}}
 smtpd_tls_auth_only = yes