diff --git a/mod/forum/lib.php b/mod/forum/lib.php
index 106f0d9088f57..4d350c707a6cc 100644
--- a/mod/forum/lib.php
+++ b/mod/forum/lib.php
@@ -720,6 +720,11 @@ function forum_cron() {
                 $eventdata->contexturl = "{$CFG->wwwroot}/mod/forum/discuss.php?d={$discussion->id}#p{$post->id}";
                 $eventdata->contexturlname = $discussion->name;
 
+                // If forum_replytouser is not set then send mail using the noreplyaddress.
+                if (empty($CFG->forum_replytouser)) {
+                    $eventdata->userfrom->email = $CFG->noreplyaddress;
+                }
+
                 $mailresult = message_send($eventdata);
                 if (!$mailresult){
                     mtrace("Error: mod/forum/lib.php forum_cron(): Could not send out mail for id $post->id to user $userto->id".
@@ -1011,10 +1016,9 @@ function forum_cron() {
                 }
 
                 $attachment = $attachname='';
-                $usetrueaddress = true;
                 // Directly email forum digests rather than sending them via messaging, use the
                 // site shortname as 'from name', the noreply address will be used by email_to_user.
-                $mailresult = email_to_user($userto, $site->shortname, $postsubject, $posttext, $posthtml, $attachment, $attachname, $usetrueaddress, $CFG->forum_replytouser);
+                $mailresult = email_to_user($userto, $site->shortname, $postsubject, $posttext, $posthtml, $attachment, $attachname);
 
                 if (!$mailresult) {
                     mtrace("ERROR!");