Bug 359315: "NNTP" and "IO" should be filtered out of the mail_delivery_method…

Bugzilla/Config/MTA.pm

@@ -44,7 +44,9 @@ sub get_param_list {
   {
    name => 'mail_delivery_method',
    type => 's',
-   choices => [Email::Send->new()->all_mailers(), 'None'],
+   # Bugzilla is not ready yet to send mails to newsgroups, and 'IO'
+   # is of no use for now as we already have our own 'Test' mode.
+   choices => [grep {$_ ne 'NNTP' && $_ ne 'IO'} Email::Send->new()->all_mailers(), 'None'],
    default => 'Sendmail',
    checker => \&check_mail_delivery_method
   },