diff -urN ../exim-4.93.orig/src/deliver.c ./src/deliver.c
--- ../exim-4.93.orig/src/deliver.c	2023-11-04 14:55:49.000000000 +0200
+++ ./src/deliver.c	2023-11-05 21:27:32.580686000 +0200
@@ -2615,7 +2615,10 @@
     FILE *f = fdopen(fd, "wb");
     if (errors_reply_to && !contains_header(US"Reply-To", warn_message))
       fprintf(f, "Reply-To: %s\n", errors_reply_to);
-    fprintf(f, "Auto-Submitted: auto-replied\n");
+    fprintf(f, "Auto-Submitted: auto-replied\n"
+      "X-Reporting-MTA: dns; %s\n",
+      smtp_active_hostname
+    );
     if (!contains_header(US"From", warn_message))
       moan_write_from(f);
     fprintf(f, "%s", CS warn_message);
@@ -5659,7 +5662,10 @@
 
   if (errors_reply_to)
     fprintf(fp, "Reply-To: %s\n", errors_reply_to);
-  fprintf(fp, "Auto-Submitted: auto-replied\n");
+  fprintf(fp, "Auto-Submitted: auto-replied\n"
+    "X-Reporting-MTA: dns; %s\n",
+    smtp_active_hostname
+  );
   moan_write_from(fp);
   fprintf(fp, "To: %s\n", bounce_recipient);
   moan_write_references(fp, NULL);
@@ -6045,7 +6051,10 @@
 
 if (errors_reply_to)
   fprintf(f, "Reply-To: %s\n", errors_reply_to);
-fprintf(f, "Auto-Submitted: auto-replied\n");
+fprintf(f, "Auto-Submitted: auto-replied\n"
+  "X-Reporting-MTA: dns; %s\n",
+  smtp_active_hostname
+);
 moan_write_from(f);
 fprintf(f, "To: %s\n", recipients);
 moan_write_references(f, NULL);
@@ -6272,8 +6281,10 @@
 
     moan_write_from(f);
     fprintf(f, "Auto-Submitted: auto-generated\n"
+	"X-Reporting-MTA: dns; %s\n"
 	"To: %s\n"
 	"Subject: Delivery Status Notification\n",
+      smtp_active_hostname,
       sender_address);
     moan_write_references(f, NULL);
     fprintf(f, "Content-Type: multipart/report;"
diff -urN ../exim-4.93.orig/src/moan.c ./src/moan.c
--- ../exim-4.93.orig/src/moan.c	2023-11-04 14:55:49.000000000 +0200
+++ ./src/moan.c	2023-11-05 21:25:35.133743000 +0200
@@ -206,7 +206,10 @@
 
 fp = fdopen(fd, "wb");
 if (errors_reply_to) fprintf(fp, "Reply-To: %s\n", errors_reply_to);
-fprintf(fp, "Auto-Submitted: auto-replied\n");
+fprintf(fp, "Auto-Submitted: auto-replied\n"
+  "X-Reporting-MTA: dns; %s\n",
+  smtp_active_hostname
+);
 
 #ifdef SUPPORT_DMARC
 if (s)