Deleting leads with invalid emails from Campaign

[climbing-alien]

Hi

I have run a Campaign with some 20k leads. A lot of the emails I have been given are wrong and so have bounced back.

The Campaign is showing all the invalid emails correctly. So have a couple of questions

1) Should Sugarcrm have marked the email addresses as invalid on each leads record automatically.
2) If not how can I now mark them as invalid in each record and then
2) How can I now delete or search for all the leads that have invalid emails.'
'
Im running SugarCRM 6.1

Thanks in advance

[climbing-alien]

Bump. no one can answer these??