diff -U4 -r exim-4.63/src/acl.c exim-4.63+data-accept-message/src/acl.c
--- exim-4.63/src/acl.c	2006-07-31 15:19:48.000000000 +0100
+++ exim-4.63+data-accept-message/src/acl.c	2006-08-26 14:04:41.000000000 +0100
@@ -3006,8 +3006,9 @@
 If there isn't a log message set, we make it the same as the user message. */
 
 if (((rc == FAIL_DROP)? FAIL : rc) == msgcond[verb] ||
     (verb == ACL_DISCARD && rc == OK) ||
+    (where == ACL_WHERE_DATA && rc == OK) ||
     (where == ACL_WHERE_QUIT))
   {
   uschar *expmessage;
 
@@ -3022,17 +3023,25 @@
   if (verb == ACL_WARN) *log_msgptr = *user_msgptr = NULL;
 
   if (user_message != NULL)
     {
-    acl_verify_message = old_user_msgptr;
+    /* If the verb is "accept" or "require" in the DATA ACL, the previous
+    message should not be used as the acl_verify_message. */
+
+    if (where == ACL_WHERE_DATA && rc == OK)
+      acl_verify_message = NULL;
+    else
+      acl_verify_message = old_user_msgptr;
+
     expmessage = expand_string(user_message);
     if (expmessage == NULL)
       {
       if (!expand_string_forcedfail)
         log_write(0, LOG_MAIN|LOG_PANIC, "failed to expand ACL message \"%s\": %s",
           user_message, expand_string_message);
       }
     else if (expmessage[0] != 0) *user_msgptr = expmessage;
+    else *user_msgptr = NULL;
     }
 
   if (log_message != NULL)
     {
@@ -3206,8 +3215,9 @@
 int fd = -1;
 acl_block *acl = NULL;
 uschar *acl_name = US"inline ACL";
 uschar *ss;
+BOOL require_message = FALSE;
 
 /* Catch configuration loops */
 
 if (level > 20)
@@ -3328,9 +3338,11 @@
   int cond;
   int basic_errno = 0;
   BOOL endpass_seen = FALSE;
 
-  *log_msgptr = *user_msgptr = NULL;
+  *log_msgptr = NULL;
+  /* If a "require" verb returned a message (only set when processing a DATA ACL), don't reset it. */
+  if (!require_message) *user_msgptr = NULL;
   acl_temp_details = FALSE;
 
   if (where == ACL_WHERE_QUIT &&
       acl->verb != ACL_ACCEPT &&
@@ -3439,8 +3451,10 @@
     break;
 
     case ACL_REQUIRE:
     if (cond != OK) return cond;
+    /* If this is a DATA ACL, the message needs to be preserved. */
+    if (where == ACL_WHERE_DATA) require_message = (*user_msgptr != NULL ? TRUE : FALSE);
     break;
 
     case ACL_WARN:
     if (cond == OK)
@@ -3466,8 +3480,9 @@
 
 /* We have reached the end of the ACL. This is an implicit DENY. */
 
 HDEBUG(D_acl) debug_printf("end of %s: implicit DENY\n", acl_name);
+if (require_message) *user_msgptr = NULL;
 return FAIL;
 }
 
 
Only in exim-4.63+data-accept-message/src: acl.c.orig
diff -U4 -r exim-4.63/src/receive.c exim-4.63+data-accept-message/src/receive.c
--- exim-4.63/src/receive.c	2006-07-31 15:19:48.000000000 +0100
+++ exim-4.63+data-accept-message/src/receive.c	2006-08-26 14:05:04.000000000 +0100
@@ -1278,8 +1278,9 @@
 
 /* Final message to give to SMTP caller */
 
 uschar *smtp_reply = NULL;
+uschar *user_msg = NULL;
 
 /* Working header pointers */
 
 header_line *h, *next;
@@ -2929,9 +2930,9 @@
     them. */
 
     if (acl_smtp_data != NULL && recipients_count > 0)
       {
-      uschar *user_msg, *log_msg;
+      uschar *log_msg;
       rc = acl_check(ACL_WHERE_DATA, NULL, acl_smtp_data, &user_msg, &log_msg);
       add_acl_headers(US"DATA");
       if (rc == DISCARD)
         {
@@ -3484,8 +3485,10 @@
       {
       if (fake_response != OK)
         smtp_respond((fake_response == DEFER)? US"450" : US"550", 3, TRUE,
           fake_response_text);
+      else if (user_msg != NULL)
+        smtp_printf("250 OK id=%s %s\r\n", message_id, user_msg);
       else
         smtp_printf("250 OK id=%s\r\n", message_id);
       if (host_checking)
         fprintf(stdout,
Only in exim-4.63+data-accept-message/src: receive.c.orig