Password reset not working, form submission not working; Email not working

yes, debugging will help. Also, you can talk to you hosting provider or check your Cpanel for email settings. For example,

Code:

$config['smtp_host'] = 'mydomainnamehost.com';

 
must be

Code:

$config['smtp_host'] = 'mail.mywebsite.com';

for the providers I work with.