diff -urN ../exim-4.93.orig/src/deliver.c ./src/deliver.c
--- ../exim-4.93.orig/src/deliver.c	2019-12-08 14:53:48.000000000 +0200
+++ ./src/deliver.c	2020-08-20 01:18:29.101025000 +0300
@@ -2613,7 +2613,10 @@
     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);
@@ -7362,8 +7365,10 @@
 
     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;"
@@ -7601,7 +7606,10 @@
 
       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);
@@ -8212,7 +8220,10 @@
 
         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);
diff -urN ../exim-4.93.orig/src/moan.c ./src/moan.c
--- ../exim-4.93.orig/src/moan.c	2019-12-08 14:53:48.000000000 +0200
+++ ./src/moan.c	2020-08-20 01:01:36.959726000 +0300
@@ -183,7 +183,10 @@
 
 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)