From abb70a6b1488906b662597f0d15638c19b35aedd Mon Sep 17 00:00:00 2001
From: Treefit <dafuer@simonlaux.de>
Date: Fri, 28 Nov 2025 09:34:44 +0100
Subject: [PATCH] Handle case where user followed the tutorial and set the
 CNAME reccord for mta-sts, but no TXT record for it yet.

---
 cmdeploy/src/cmdeploy/remote/rdns.py | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/cmdeploy/src/cmdeploy/remote/rdns.py b/cmdeploy/src/cmdeploy/remote/rdns.py
index cc151e91..5b79d436 100644
--- a/cmdeploy/src/cmdeploy/remote/rdns.py
+++ b/cmdeploy/src/cmdeploy/remote/rdns.py
@@ -37,7 +37,10 @@ def perform_initial_checks(mail_domain, pre_command=""):
         return res
 
     # parse out sts-id if exists, example: "v=STSv1; id=2090123"
-    parts = query_dns("TXT", f"_mta-sts.{mail_domain}").split("id=")
+    mta_sts_txt = query_dns("TXT", f"_mta-sts.{mail_domain}")
+    if not mta_sts_txt:
+        return res
+    parts = mta_sts_txt.split("id=")
     res["sts_id"] = parts[1].rstrip('"') if len(parts) == 2 else ""
     return res