1 files changed, 2 insertions, 0 deletions
diff --git a/Bugzilla/Mailer.pm b/Bugzilla/Mailer.pm
index 699467ed8..f8d5e9556 100644
--- a/Bugzilla/Mailer.pm
+++ b/Bugzilla/Mailer.pm
@@ -171,6 +171,8 @@ sub MessageToMTA {
     Bugzilla::Hook::process('mailer_before_send', 
                             { email => $email, mailer_args => \@args });
 
+    return if $email->header('to') eq '';
+
     if ($method eq "Test") {
         my $filename = bz_locations()->{'datadir'} . '/mailer.testfile';
         open TESTFILE, '>>', $filename;