diff --git a/main.go b/main.go
index 86fd9d5..e5f702a 100644
--- a/main.go
+++ b/main.go
@@ -177,6 +177,7 @@ func modifyPasswordFile(email, password string) bool {
 		out.WriteString("\n")
 	}
 	out.Close()
+	os.Rename("/root/docker/mail/config/postfix-accounts.cf", "/root/docker/mail/config/postfix-accounts.cf.old")
 	os.Rename("/root/docker/mail/config/postfix-accounts.cf.tmp", "/root/docker/mail/config/postfix-accounts.cf")
 	return true
 }