From f9609304cd7ffe553e3da325287973a0b2a4446c Mon Sep 17 00:00:00 2001
From: Heiko Schlichting <heiko@fu-berlin.de>
Date: Thu, 29 Feb 2024 19:26:48 +0000
Subject: [PATCH] Fix crash on empty -oMt argument.  Bug 3070

---
 src/src/smtp_in.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/src/smtp_in.c b/src/src/smtp_in.c
index ff768e94c..f62d6fbf2 100644
--- a/src/src/smtp_in.c
+++ b/src/src/smtp_in.c
@@ -1352,7 +1352,7 @@ if (host_checking)
   g = string_cat(g, hostname);
 
 else if (f.sender_host_unknown || f.sender_host_notsocket)
-  g = string_cat(g, sender_ident);
+  g = string_cat(g, sender_ident ? sender_ident : US"NULL");
 
 else if (f.is_inetd)
   g = string_append(g, 2, hostname, US" (via inetd)");
-- 
2.30.2